Math games

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These games require the Microsoft VB6 runtimes to be installed beforehand.

2OrDie

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version 1.0
Updated 22 September 2012

Help

Multiply by 2 or remove a digit to get from source to a target number.

Example: can go from 19 to 36 with sequence 19, 9, 18 and 36.
Must multiply by 2 at lease once during the sequence
Intermediate numbers cannot be more than 999

Program Features

Main features of this program are:

Create new puzzles or solve existing ones
Create single or multiple puzzles
Select a multiplier, 2 to 9; default is 2
Print single or multiple puzzles
Export puzzles in text format
Copy a puzzle to Clipboard
Set display colour schemes
Use one of 20,000 ready made puzzles 222Kb

beeHive

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version 1.0
Updated 4 September 2012

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Find the number of B's in a hexagon. Sum of B's surrounding a hexagon is given. There can be a maximum of three B's in a hexagon. Puzzle size can be 4x4 to 12x12 hexagons. 20,000 readymade puzzles are provided with this program.

How to Solve

Create a new puzzle or select one from 20,000 puzzles provided
Normally one would print a puzzle and solve on paper
Total of surrounding B's is shown in each hexagon
Move mouse over a hexagon and click one, two or three B's to place 1,2 or 3 Bs in a hexagon
Or right click on a hexagon to place 1,2 or 3 B's consecutively
Press Escape to clear all B's
Can also use arrow keys to navigate
As you place B's, the total sum of B's in adjacent hexagons will be updated and displayed
Puzzle is solved when your sum of B's in a hexagon matches with the sum given
Click check solution button to verify your solution
20,000 puzzles are provided Download

Program Features

4x4 to 12x12 grid size. Puzzle size with more than 81 hexagons may take some time to create.
Create grid patterns by hiding cells
Print single or multiple puzzles
Print and solve from 20,000 puzzles provided
Select display colour schemes

CircuSum

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version 1.0
Updated 1 December 2013

Help

Fill numbers 0 to 9 around a circle. Sum of any two adjacent numbers is equal to the sum of the two numbers at opposite ends. Each puzzle has a unique solution that can be reached by logic alone without any guesswork. Some cell values are given as hints.

Program Features

Main features of this program are:

Create and save new puzzles
See a step-wise solution of a puzzle
Print single or multiple puzzles. Puzzles printed by this program are for personal use only.
Copy a puzzle to Clipboard
Set display colour schemes
Use one of 7,000 ready made puzzles 35Kb. These puzzles are for personal use only - cannot be published or distributed in any shape or form.

Connect

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Version 1.0
Updated 12 June 2008

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Connect is a variation of the Number Link puzzle (by Nikoli - 2006).
The player has to connect a node (a circle) with a number using as many cells as the number. Count of cells used includes the circle and the number as well. The lines cannot branch off or cross over each other, and the numbers have to fall at one end and the circle at the other. All cells must be filled with line and there is only one unique solution for a puzzle. 20,000 Puzzles provided with this program have unique solutions. Program handles puzzle size 5x5 to 16x16.

Generally Connect puzzles are rather easy to solve - size 8x8 and below in particular. Nevertheless they are good fun to try. This program will generate puzzles that have unique solutions. Caution - puzzle size 12x12 and above may take some time to generate.

How to Play

Normally you would print a puzzle and solve it on paper at your leisure. You can also connect numbers on screen using the following commands:

Leftclick mouse on a cell and drag mouse to the new location
Release leftclick to draw a line
A line can only be vertical or horizontal
Can draw a line in many horizontal and vertical segments if necessary
Cannot cross lines
Cannot draw a line through a number or a circle
Must connect one number with one circle only
Each puzzle has a unique solution

Program Options

Select line, number and circle colours of your choice
Use circle or a rectangle as a node
Save and reload puzzles
Print puzzles and their solutions
Use one of 20,000 puzzles or let program create one at random
Set display colour schemes
20,000 puzzles with solutions Download
Set display colour schemes

CrosSequence

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version 1.0
Updated 22 September 2012

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Fill a grid such that cross cells at any location are in sequence. Cross cells are left and right, and, top and bottom of a cell. Sequence is a mathematical sequence like 1,2,3 or 4,6,8 or 1,5,9 etc. There are no duplicate numbers in any row or any column of the grid. Some cells are given and some may be blacked out (not part of a sequence). Puzzle size is 5x5 to 9x9. Each puzzle has a unique solution that can be reached by logic alone without any guesswork.

Program Features

Main features of this program are:

Create new puzzles, grid size 5x5 to 9x9
Create and save puzzles
Autosolve a puzzle with a log of solution steps
Save solution log
Print single or multiple puzzles
Export puzzles in text format
Copy a puzzle to Clipboard
Set display colour schemes
Use one of 20,000 ready made puzzles 540Kb

DigiDots

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Version 1.0
Updated 5 January 2010

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Find the number of black circles around a cell (a hexagon) matching the number inside the cell. Each cell has a number 1 to 4. Black circles around a cell must be linked. Five black circles are given as hint for an easy puzzle while a hard puzzle has three hints only.

Program Features

Create single or multiple puzzles of difficulty Easy or Hard
Solve on-screen or print and solve on paper
Print single or multiple puzzles
Unlimited undos
Save and load saved puzzles
Select display colours and options
20,000 puzzles with solutions Download

Equator

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Version 1.0
Updated 21 July 2009

Help

Equator is a Sudoku clone where the grid is segmented into a number of Areas. Clues appear in each Area, each Clue being a result of mathematical operations on the numbers contained in that Area. You are required to fill the grid with numbers 1 to 9 (for a 9x9 grid) given the following rules:

Clues in each area must be satisfied
No duplicate numbers in a row or a column
Some numbers in the grid are already shown as givens

Puzzles come in size 3x3 to 9x9 with varying level of difficulty. Each puzzle has a unique solution and is solvable by logic alone without any guesswork. 20,000 ready made puzzles are provided with the program.

Program Options

Create puzzles with random or given grid size
Create puzzles with a preset layout of Areas
Edit existing puzzles
Preset Difficulty Levels for new puzzles
Import and solve puzzles from other sources
Verify uniqueness of puzzle solution
Solve puzzles on screen
Get and apply hints
Auto solve a puzzle in one shot or step-wise, program will explain how a puzzle was solved
Unlimited undos
Zoom and pan for an enlarged view of the grid
Select foreground and background colours of numbers and grid lines
Create and save puzzles in bulk
Explore a puzzle file and select a specific puzzle to load
Print puzzles and their solutions in different page layouts
20,000 puzzles with solutions Download

Fillomino

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version 1.0
Updated 10 August 2012

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Fillomino is a logic puzzle published by Nikoli. Fillomino is played on a rectangular grid with no standard size; the internal grid lines are often dotted. Object of solving the puzzle is to place numbers into the empty cells so that the grid is divided into regions of cells all containing the exact same number. Each region must contain exactly as many cells as the number that it contains. Two regions of the same size cannot touch each other, either vertically or horizontally. At least one or 2(optional) numbers in a region are displayed. Puzzle size can be 5x5 to 20x20 rectangular like 12x12, 5x20 or 20x10 etc. 20,000 readymade puzzles are provided with this program.

How to Solve

Create a new puzzle or select one from 20,000 puzzles provided
Normally one would print a puzzle and solve on paper
Move mouse over a cell and enter number (1-9)
Can also rightclick to enter a number
Can enter more than one digit in a cell as reminder of potential solutions
Continue solution while updating pencils
Click check solution button to verify your solution
20,000 puzzles are provided Download

Program Features

5x5 to 20x20 grid size. Puzzle size with more than 256 cells may take some time to create.
Create grid patterns by hiding cells
Print single or multiple puzzles
Print and solve from 20,000 puzzles provided
Select display colour schemes

FlipFour

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Version 1.0
Updated 1 September 2009

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FlipFour is a simple math puzzle. A set of white and black cells with numbers are given. When flipped, a white number will turn to black and vice versa. You must flip four cells to get a given sum for all white numbers. Each puzzle has a unique solution. Puzzles come in 9 different sizes. This puzzle appears deceptively easy but require considerable mental maths to solve. This is how you solve a puzzle on screen:

Examine the numbers displayed, with white or black background
Now consider how to get a required sum of white numbers
Certain whites may have to be flipped to black (for not to be included in the sum) or some blacks should be whites (to get added to the sum)
Then click on a cell to flip, a black number will flip to white and vice versa. Sum of the white numbers will be updated accordingly.
You must flip four different cells (no less no more). For example if in a puzzle, the current and the required sum of white cells is same, user cannot click a cell four times to solve.
Click on any place outside the grid to undo a flip
Running total is given at the bottom right of the window
You can also use arrow keys to get to a cell and press Spacebar or Return to flip the colour. Press Delete undo the previous flip.
Puzzle is solved when after four flips all the white numbers add up to the required sum
3,000 puzzles with solutions are provided with this program Download

FourSum

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version 1.0
Updated 22 September 2012

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Fill a 3x3 grid with numbers 1 to 9. Sum of four adjacent cells are given. Each puzzle has a unique solution that can be reached by logic alone without any guesswork. Sujiko and Suko puzzles, created by Jai Kobayaashi Gomer, are special cases of a FourSum puzzle. This program can create as well solve existing FourSum puzzles. Program will detect and show multiple solutions if any for an imported puzzle.

Program Features

Main features of this program are:

Create new puzzles with none upto 3 cells given as hint, and with or without colour zones. Puzzles without a hint cell and no colour zone will obviously be hardest to solve.
Create and save new puzzles
Print single or multiple puzzles. Puzzles printed by this program are for personal use only.
Import and solve Sujiko or Suko puzzles
Detect and show multiple solutions of imported puzzles
Copy a puzzle to Clipboard
Set display colour schemes
Use one of 20,000 ready made puzzles 231Kb. These puzzles are for personal use only - cannot be published or distributed in any shape or form.

FourSumSuper

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version 1.0
Updated 22 September 2012

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FourSumSuper a Latin Square puzzle. Fill nine 3x3 areas of a 9x9 grid with numbers 1 to 9 such that there are no duplicate numbers in any row, column or an area, like a Sudoku puzzle. Sums of four adjacent cells are given. Some cells are also given as hints. Each puzzle has a unique solution that can be reached by logic alone without any guesswork.

Program Features

Create and save new puzzles
Print single or multiple puzzles. Puzzles printed by this program are for personal use only.
Copy a puzzle to Clipboard
Set display colour schemes
Use one of 20,000 ready made puzzles 930Kb. These puzzles are for personal use only - cannot be published or distributed in any shape or form.

FutoShiki V2

Download v2
Updated 14 December 2006

Download
25,000 puzzles of size 3x3 to 9x9

Help

FutoShiki puzzle is normally played on a 5x5 grid. The objective is to place the numbers 1 to 5 in each row, ensuring that each column also only contains the digits 1 to 5. Some digits are given at the start. In addition, constraints are also specified between some of the squares, such that one number is higher or lower than its neighbor. These constraints must be met as the grid is filled out.

Create new puzzles manually or automatically. Automatic creation offers unique puzzle each time with different levels of difficulty.
Solve existing puzzles manually or let program solve it.
Save puzzles
Print puzzles and solutions

New in Version 2:

Puzzle size 3x3 to 9x9
Different levels of difficulty

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GearUp

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version 1.0
Updated 15th November 2009

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Align numbers by rotating gears. Four numbers are marked on each gear: left, right, top and bottom. Objective of the game is to get the top numbers on the gears same as the target numbers. One can:

Rotate gears left or right; linked gears will rotate accordingly

Swap two adjacent gears

Disengage the left or right gear. A disengaged gear will not move with the rotation of the remaining gears.

Hashiwokakero

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version 1.0
Updated 7th March 2007

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Hashiwokakero is played on a rectangular grid with no standard size, although the grid itself is not usually drawn. Some cells start out with (usually encircled) numbers from 1 to 8 inclusive; these are the islands. The rest of the cells are empty. The goal is to connect all of the islands into a single connected group by drawing a series of bridges between the islands. The bridges must follow the criteria below:

They must begin and end at distinct islands, traveling in a straight line in between
They must not cross any other bridges or islands
They may only up/down or across
At most two bridges connect a pair of islands
The number of bridges connected to each island must match the number on that island

Solving a Hashiwokakero puzzle is a matter of procedural force: having determined where a bridge must be placed, placing it there can eliminate other possible places for bridges, forcing the placement of another bridge, and so on.

This program helps you solve existing Hashiwokakero puzzles as well as create new ones. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different grid sizes from 7x7 to 25x25
Solve existing puzzles manually or let program solve it
Save puzzles as bitmap files
Print puzzles and solutions
Display options include: circular or square islands, island size and display color schemes
Puzzle size limitation of 7x7 to a maximum 25 rows and 25 columns
20,000 puzzles with varying levels of difficulty and solutions are provided. Download

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HexaNum

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Version 1.0
Updated 31 October 2009

Help

Fill each hexagon with numbers 1 to 6. Touching cells across two hexagons must have same number. Some numbers are already fixed.

Program Features

Create single or multiple puzzles with Easy or Hard difficulty level
Solve on-screen or print and solve on paper
Print single or multiple puzzles
Unlimited undos
Save and load saved puzzles
Select display colours and options
20,000 puzzles with solutions Download

Hexoku

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version 1.0
Updated 22 September 2012

Help

Fill each hexagon with numbers 1 to 6. Two numbers at touching sides must add up to 7.

How to Play

Create and print a puzzle and solve at your leisure. Puzzle can also be solved on screen.

Program Features

Print single or multiple puzzles
Print and solve from 20,000 puzzles provided
Select display colour schemes
Copy a puzzle to Clipboard
20,000 puzzles are provided Download

Heyawake

Download now
version 1.0
Updated 21 August 2006

Download 20,000 puzzles

Help

This program helps you solve existing Heyawake puzzles as well as create new ones. Heyawake is another Japanese number puzzle (yes another one). Heyawake is played on a rectangular grid of cells with no standard size; the grid is divided into variously sized rectangular "rooms" by bold lines following the edges of the cells. Some rooms may contain a single number, typically printed in their upper-left cell; as originally designed, every room was numbered, but this is rarely necessary for solving and is no longer followed. Some of the cells in the puzzle are to be painted black; the object of the puzzle is to determine for each cell if it must be painted or must be left blank (remaining white). Main features of this program are: In this program you can:

Create new puzzles manually or automatically. Automatic creation offers unique puzzle each time with different levels of difficulty. This program has a puzzle size limitation of maximum 16 rows and 16 columns.
Solve existing puzzles manually or let program solve it.
Save puzzles
Print puzzles and solutions

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Hitori

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version 1.0
Updated 1 February 2006

Download 20,000 puzzles

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This programs solves existing Hitori puzzles as well as creates new ones. Hitori is mathematical game where a square grid is filled with numbers. Some numbers in a row or a column are duplicated. The object of the game is to locate these duplicates and mark them blank, given the following three rules:

Numbers may never appear more than once in each row or column
Black cells are never adjacent in a row or a column
Empty cells create a single continuous area, undivided by black cells

This program has a puzzle size limitation of maximum 17 rows and 17 columns.

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Kakuro

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version 1.0
Updated 7 January 2006

Download 20,000 puzzles

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This programs helps you solve existing KaKuRo puzzles as well as create new ones. KaKuRo (or Cross Sums) is a puzzle that is solved much like a crossword puzzle, using digits instead of letters. Where an entry in a regular crossword may form a word, the digits in a Cross Sums entry add up to a sum. The sums, or clues, are embedded in a shaded square of the puzzle. The top right number is the across sum while the bottom right number is a down sum. Only the digits 1 through 9 are used and no digit may appear more than once in any sum. The object of the puzzle is to insert a digit from 1 to 9 inclusive into each non-shaded cell such that the sum of the numbers in each entry matches the sum associated with it and that no digit is duplicated in any entry.

Main features of this program are:

Manually solve existing Puzzles
Auto Solve existing puzzles
Create and save new Puzzles
Compile new Puzzles from existing layouts
Print single or multiple puzzles

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Lineup123

Download now
Version 1.0
Updated 3 June 2011

Help

Line up numbers 123... Use arrow keys to shift columns and rows of numbers. Grid size is 3x3 to 9x9.

How to Play

Use arrow keys to shift columns and rows of numbers

Program Features

Grid size 3x3 to 9x9
Auto solve

LatinLink

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Version 1.0
Updated 13 February 2012

Help

LatinLink is a Latin Square puzzle size 4x4 to 9x9. A puzzle has 9 rows (for a 9x9 puzzle), 9 columns and 9 links. Fill each Row, each Column and each Link with number 1 to 9 (for a 9x9 puzzle). No duplicate numbers in any Row, Column or a Link. 20,000 readymade puzzles are provided with this program. Generally a LatinLink puzzle will be easier than a standard Sudoku puzzle. All LatinLink puzzles can be solved by logic alone without any guesswork. A special case of a 9x9 LatinLink puzzle is where links are confined to nine 3x3 areas; this would be a Sudoku puzzle. 4x4 puzzles are very easy; good for younger players to understand Latin Squares.

Terminology

Grid: 9x9 squares containing 81 cells down to 4x4 squares in a 4x4 puzzle
Cell: A single square that contains one number in the grid
Row: A horizontal line of 9, 8, 7, 6, 5 or 4 cells for a 9x9, 8x8, 7x7, 6x6, 5x5 or a 4x4 puzzle
Column: A vertical line of 9, 8, 7, 6, 5 or 4 cells for a 9x9, 8x8, 7x7, 6x6, 5x5 or a 4x4 puzzle
Link: A continuous sequence of connected cells

Objective

The objective is to fill the grid with numbers from 1 to N (for a NxN puzzle) in a way that each Row, Column and a Link contains each number exactly once

How to Solve

Create a new puzzle or select one from 20,000 puzzles provided.
Normally one would print a puzzle and solve on paper
Examine each zone and narrow down possible candidates for solution
Fill in candidates
Apply LatinLink rules and eliminate candidates as seen fit given that there are no duplicates in a Row, Column or a Link
Puzzle can also be solved on screen:
- Create a new puzzle or load from one of the 20,000 ready made provided
- Click Updatepencils to find possible cell candidates (pencil marks)
- Move mouse over a cell and enter number 1 to 9 as your guess
- Can enter more than one digit in a cell as reminder of potential solutions
- Continue solution while updating pencils
- Click check solution button to verify your solution
- You can let computer show you solution stepwise

How to navigate

Move mouse over a cell and enter a number
Can enter more than one digit in a cell as reminder of potential solutions
Use arrow keys to navigate through cells. Place mouse cursor outside the grid for ease of navigation when using arrow keys.
Click Updatepencils button or press F2 to recalculate pencil marks
Right click on a cell or press F3 to place current pencil mark in the cell

Program Features

9x9 to 4x4 grid size
Create and save new puzzles
Creat special case 9x9 LatinLink puzzles where links are confined to nine 3x3 areas; these would be Sudoku puzzles
Print single or multiple puzzles
Print and solve from 20,000 puzzles provided
Let computer show you the solution stepwise
Select display colour schemes
Print and solve from 20,000 puzzles provided Download

LatinOrder

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version 1.0
Updated 20 June 2012

Help

LatinOrder is a Latin Square puzzle size 8x8. Fill each Row, each Column and each Link with number 1 to 8: no duplicate numbers in any Row or a Column. Sixteen nodes have 'order' clues, indicating how a set of three cells around a node are ordered. Three cells are shown linked starting with a small square to ending with a large square. The values in the three cells must be in the increasing order, from small to large square. Some cells are fixed. Puzzle size can be 4x4, 6x6 or 8x8. 20,000 readymade puzzles are provided with this program.

How to Play

Select puzzle size. Then create and print a puzzle and solve at your leisure. Puzzle can also be solved on screen. Click a cell to set/clear black.

Program Features

Create a new puzzle or load from one of the 20,000 ready made provided
Click Updatepencils to find possible cell candidates (pencil marks)
Move mouse over a cell and enter number 1 to 8 as your guess
Can enter more than one digit in a cell as reminder of potential solutions
Continue solution while updating pencils
Click check solution button to verify your solution
20,000 puzzles are provided Download

Make9

Download now
version 1.0
Updated 24 July 2008

Help

Introduction
This is a popular game with younger children traveling in a car. You pickup number plate of a car passing by, take first six numbers and add, subtract these to get a total of 9. This program simulates that game. A good exercise in mental maths.

How to Play

Click Next to start a new game
Six digits will then be given for you to make number 9 using the following rules:
- Left click on a number to be used in a calculation
- Click on + and - sign to select addition or subtraction, result will be calculated and displayed
- Right click on a number to undo its inclusion in a calculation
- Must use each number once and once only
- Can only add or subtract numbers, no multiplications or divisions
- Cannot have zero or negative numbers as answers
- Can use an intermediate result in calculations
- There could be several solutions to a puzzle
Scoring is based on the number of puzzles solved within a time limit of three minutes

Magicsquare

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version 1.0
Updated 21 July 2004

Help

A magic square is an arrangement of the numbers from 1 to n^2 (n-squared) in an nxn matrix, with each number occurring exactly once, and such that the sum of the entries of any row, any column, or any main diagonal is the same. It is not hard to show that this sum must be n(n^2+1)/2.

Sometimes the magic squares above are called 'normal' squares, where cells are filled with numbers 1 to n for a grid of size n. Another set of magic squares is where a cell may be filled with any number, with the sum of rows, columns and diagonals being a pre-selected number.

This program computes 'normal' as well as the 'variable' types of magic squares. Following options are provided:

Grid Size can be 3 to 50. Note that larger grid sizes will take a long time to solve
Solve - Auto, computer will calculate the MagicSquare. For variable magic squares, the program uses a combination of random guesses and solution of equations in order to arrive at a solution quickly. Each variable magic square solution is likely to be different. For normal squares a combination of La Loubere and LUX methods are used
Solve - Manual, a blank grid is presented for user to enter numbers in the grid and solve the puzzle. Right click on a cell to a get drop-down menu for manipulating cell values
Print - Print the solution and the empty grid for attempting solution on paper. Maximum grid Size that can be printed is 30
Many more interesting options

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Makenum

Download now
version 2.0
Updated 24 November 2005

Help

The purpose of this challenging game is to make a number from a set of six numbers.

The computer selects the number that you are required to make along with six other numbers. You select any two numbers and apply addition, subtraction, multiplication or division to get an answer. This answer is added to the set of remaining numbers. You repeat this process until the desired answer is obtained.

In order to make 468 from 1,22,34,7,13,25 one solution would be:

7 + 13 = 20
25 - 1 = 24
20 * 24 = 480
480 + 22 = 502
502 - 34 = 468

Note that you may use a number only once. You may use the required number for intermediate calculations. In order to select a number click left-mouse-button on the number Click on + - / or * for mathematical operations. All six numbers must be used for the target.

The updated version has auto solution by computer and user can specify a puzzle for computer to solve.

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Masyu

Download now
version 1.0
Updated 14 May 2007

Help

Masyu is played on a rectangular grid of squares, some of which contain circles; each circle is either white or black. The goal is to draw a single continuous non-intersecting loop that properly passes through all circled cells. Rules of the puzzle are:

Make a single loop. Lines must pass through the centers of cells horizontally or vertically and never cross, branch off, or go through the same cells twice.
Lines must pass through all cells containing black and white circles.
Lines passing through a white circle cell must go straight through the cell, then make a right-angled turn in the very next cell (on at least one side of the white circle cell).
Lines passing through a black circle cell must make a right angled turn immediately, in the black circle cell, then go straight for the next two cells.

This program helps you solve existing Masyu puzzles as well as create new ones. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different grid sizes from 6x6 to 20x20, with maximum Rows x Columns limit of 256.
Solve existing puzzles manually or let program solve it
Create new puzzles interactively or in bulk
Save puzzles as Ascii or bitmap files
Print puzzles and solutions
20,000 puzzles with solutions Download

Mathdoku

Download now
Version 1.0
Updated 15 January 2012

Help

Mathdoku is a variation of Sudoku/Kakuro puzzle. A total of 36 calculated numbers in the 36 3-cell areas around the puzzle are given. Each calculated number is a result of addition/subtraction of related three cells. Each cell has a plus or a minus sign assigned indicating how the cell is used in the calculation. 20,000 readymade puzzles are provided with this program.

Terminology

Grid: 9x9 squares containing 81 cells
Cell: A single square that contains one number in the grid
Row: A horizontal line of 9 cells
Column: A vertical line of 9 cells
Box: A 3�3 grid of cells, total 9 boxes in the grid
Area: Three consecutive cells in a row or a column at the edge of the grid

Objective of the Game

The objective is to fill the grid with numbers from 1 to 9 such that:

Each row, column, and box contains each number exactly once
The calculation result of the three numbers in an area must match the number given at the periphery of the grid

How to Solve

Create a new puzzle or select one from 20,000 puzzles provided
Normally one would print a puzzle and solve on paper
Examine the calculation numbers around the puzzle and narrow down possible candidates for solution
Fill in candidates
Apply Sudoku rules and eliminate candidates as seen fit:
- No duplicates in a row or a column
- No duplicates in any of the nine 3x3 boxes
- Addition or subtraction of area numbers match the calculation result given
Puzzle can also be solved on screen:
- Create a new puzzle or load from one of the 20,000 ready made provided
- Click Updatepencils to find possible cell candidates (pencil marks)
- Move mouse over a cell and enter number 1 to 9 as your guess
- Examine candidates and calculated results at the periphery; locate singles
- Continue solution while updating pencils
- Click check solution button to verify your solution

How to navigate

Move mouse over a cell and enter a number
Can enter more than one digit in a cell as reminder of potential solutions
Use arrow keys to navigate through cells. Place mouse cursor outside the grid for ease of navigation when using arrow keys.
Click Updatepencils button or press F2 to recalculate pencil marks
Right click on a cell or press F3 to place current pencil mark in the cell
Move mouse over a number at the periphery - cells contributing to the calculated number will be highlighted. This option can be disabled.
Rightclick over a number at the periphery - candidate numbers contributing to the calculated number will be highlighted

Program Features

Create and save puzzles
Print single or multiple puzzles
Print and solve from 20,000 puzzles provided Download
Select display colour schemes

MathiX

Download now
Version 1.0
Updated 18 August 2009

Help

MathiX is a puzzle based on a Latin Square. A square grid must be filled with numbers 1 to 9 (for a 9x9 grid) with no duplication in row or columns. Mathematical clues are provided at the intersection of selected squares. A Clue is a symbol (one of +-x/EO=) followed by a number; for example +10, /2, x6, Even, or Odd. For a given clue all four cells at its intersection must meet the clue requirements. Some cells in the grid may already have values given. Puzzles come in size 4x4 to 9x9. Each puzzle has a unique solution.

Clues in each area must be satisfied
No duplicate numbers in a row or a column
Some numbers in the grid are already shown as givens

Puzzles come in size 4x4 to 9x9 with varying level of difficulty. Each puzzle has a unique solution and is solvable by logic alone without any guesswork. 20,000 ready made puzzles are provided with the program.

Using Clues

A Clue is a mathematical operator at the intersection of four squares in the grid. The operator determines the relationship between four numbers at the corners of the clue. For example (M is mathematical operation and v is a value):

+---+---+
+ A + B +
+--Mv---+
+ C + D +
+---+---+

If clue Mv is:

-1 then A-D or D-A must be 1 and B-C or C-B must be 1.

x4 then A*D must be 4 and B*C must be 4.

/2 then A/D or D/A must be 2 and B/C or C/B must be 2.

+3 then A+D must be 3 and B+C must be 3.

just E then A,B,C, and D must all be Even numbers (like 2,4,6, or 8)

just O then A,B,C, and D must all be Odd numbers (like 1,3,5, or 7)

just = then A=D and B=C

Program Options

Create puzzles with random or given grid size
Solve puzzles on screen
Auto solve a puzzle in one shot or step-wise, program will explain how a puzzle was solved
Unlimited undos
Zoom and pan for an enlarged view of the grid
Select foreground and background colours of numbers and grid lines
Create and save puzzles in bulk
Copy puzzle and solution to clipboard
Save Puzzle or a Solution to bmp or gif image file
Explore a puzzle file and select a specific puzzle to load
Print puzzles and their solutions in different page layouts
20,000 puzzles with solutions Download

MathWay

Download now
version 1.0
Updated 4 June 2010

Help

Draw a path from a Start node to an End node using mathematical operations on numbers in the grid. This puzzle is suitable for younger users who want to practice mental maths while enjoying the challenge of a puzzle.

How to Play

Link the start node and the end node using a single continuous path
Start and end nodes are at the edge of the grid
A hint node is given, the path must go through the hint node
A node is a number shown in rectangle or a circle
A path is established by linking a node to its neighboring node:
- A neighboring node is the next node: left, right, up or down
- Can move from a node to the next node if that link is valid
- A valid link means that there is a mathematical relationship between the current node, the destination node and the number in the middle

Main features of this program are:

Four to ten grid size
Create new puzzles of given sizes
Create new puzzles with selected Start and End nodes sides
Undo moves
Let computer show the solution
Select colour schemes and node shapes

MoreorLessSudoku

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Version 1.0
Updated 12 January 2012

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MoreorLessSudoku is a variation of Sudoku puzzle. Puzzle gives relationship between neighboring cell values as hint. A cell value can be more or less than its four (or two in outer rows and columns) neighbors. Symbols > or < are displayed for this purpose. All standard Sudoku rules apply. 20,000 readymade puzzles are provided with this program.

How to Play

Normally one would print a puzzle and solve on paper

Examine the board and find possible candidates for solution. Consider some examples below:

+-\/-+
| A  |
+-\/-+
| 8  |
+-/\-+
A must be 9

+-\/-+-\/-+
| B  < 2  |
+-\/-+-/\ +
B must be 1

+-\/-+-\/-+
| C  < 7  |
+-\/-+-/\ +
C can be 12345 or 6

+-\/-+-\/-+-\/-+-\/-+
| D  < 4  > 2  >  1 |
+-\/-+-/\ +-\/-+-\/-+
D must be 3

Fill in candidates
Apply Sudoku rules and eliminate candidates as seen fit:
- No duplicates in a row or a column
- No duplicates in any of the nine 3x3 boxes
Puzzle can also be solved on screen:
- Create a new puzzle or load from one of the 20,000 ready made provided
- Click Updatepencils to find possible cell candidates (pencil marks)
- Move mouse over a cell and enter number 1 to 9 as your guess
- Examine candidates and more or less relationships; locate singles
- Continue solution while updating pencils
- Click check solution button to verify your solution
How to navigate
- Move mouse over a cell and enter a number
- Can enter more than one digit in a cell as reminder of potential solutions
- Use arrow keys to navigate through cells; place mouse cursor outside the grid for ease of navigation
- Click UpdatePencils button or press F2 to recalculate pencil marks
- Right click on a cell or press F3 to place current pencil mark in the cell

Program Features

Create and save puzzles
Print single or multiple puzzles
Print and solve from 20,000 puzzles provided Download
Select display colour schemes

nashE

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version 1.0
Updated 14 May 2008

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Introduction
This program is a simple game using a board layout based on Nash equilibrium (named after John Forbes Nash, who proposed it). This game is not about demonstrating the equilibrium theory or its application. Nevertheless some principles of the equilibrium theory would apply when you play this game against the computer.

Board Layout
A 3x3 matrix contains nine numbers distributed randomly. Player 1 has numbers 1 to 9 in the bottom left while player 2 numbers 1 to 9 are in the to right corner of a cell.

Objective of the Game
Players 1 and 2 move alternatively. Purpose of this game is for a player to maximise its score.

How to Play

Player 1 start first by selecting a one of the three rows
Once a row is selected, player 2 must select a column in that row
Player 2 then selects a column:
- If player 2 selects same column as the row number (eg column 3 if row 3 was selected by player 1) then the respective numbers in the common row/column are added to player scores and game ends
- If player 2 selects a column (eg column 1 in row 2 selected by player 1), numbers at the intersection row and column are added to player scores
- Game continues and player 1 selects another row - then step 2 above follows ...

Program Options

Select player types: manual or computer. User can play player 1 or 2 but player 1 always starts the game
Select how a game ends:
- When same row/column are selected (default and normal mode)
- When only one cell is left. This game would last longer.
Board and player colours
Pause at computer moves

nDrop

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version 1.0
Updated 6 June 2008

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A small but tough puzzle. The layout is that there are three numbers at the top and three rows of 4 numbers each underneath. Each of the three rows has an empty cell. You are required to align three empty cells under one of the three numbers at the top. The number will drop down the empty column if the number is greater than or equal to numbers on the left and right of the empty column. Game ends when you drop down all three numbers.

How to Play

You can rotate rows and columns covering 12 numbers and three spaces. Your aim is to align numbers on the left and right of an empty column so that the number at the top may be dropped down. Note that a number can be dropped down the empty column if the number is greater than or equal to numbers on the left and right of the empty column.

Click the control button on the right of a row of numbers. Left click to rotate left and right click to rotate right.
Click the control button at the bottom to rotate a column up or down. Left click to rotate down and right click to rotate up.
When an empty column has been aligned beneath a number at the top, click the control above the top number. Number will drop if it is greater than or equal to numbers on the left and right of the empty column.
Game ends when all three numbers at the top have been dropped
Each puzzle has a valid solution

NineMath1

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version 1.0
Updated 22 September 2012

Help

Fill numbers 1 to 9 in nine cells. Math operations add, subtract, divide and multiply join values together. Two of nine solution values and one result are given as hints.

Program Features

Main features of this program are:

Create and save new puzzles
See a step-wise solution of a puzzle
Print single or multiple puzzles. Puzzles printed by this program are for personal use only.
Copy a puzzle to Clipboard
Set display colour schemes
Use one of 10,000 ready made puzzles 38Kb. These puzzles are for personal use only - cannot be published or distributed in any shape or form.

NineMath2

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version 1.0
Updated 22 September 2012

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Fill numbers 1 to 9 in nine cells. Math operations join two values into a third value as result. Math operation on two linked values can be Add, Subtract, Multiply, Divide, Average, and Greater Than. Two math results are given as hints. Each puzzle has a unique solution solved by logic alone (no guesswork).

Program Features

Main features of this program are:

Create and save new puzzles
Print single or multiple puzzles. Puzzles printed by this program are for personal use only.
Copy a puzzle to Clipboard
Set display colour schemes
Use one of 3,000 ready made puzzles 18Kb. These puzzles are for personal use only - cannot be published or distributed in any shape or form.

nLock

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version 1.0
Updated 26 March 2008

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Break the lock combination and make four numbers from a set of eight numbers and four plus and minus. Given numbers are on two circles, four horizontal and four vertical, and signs are on one circle in the middle. A pair of numbers and a plus/minus sign are aligned forming an equation and a resulting number. Rotate circles - and numbers and signs on them to get four target numbers. Like a locker combination there is only one unique set of locations that will give the desired four numbers. Use your spare time to stretch your mental math capabilities.

How to Play

Left click on a number or a sign to rotate all numbers and signs on the circle to left. Resulting numbers will be recalculated.
Right click on a number or a sign to rotate all numbers and signs on the circle to right. Resulting numbers will be recalculated.
All games are solvable

noneighbors

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version 1.0
Updated 7 June 2007

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NoNeighbors is a Suduko look alike with some subtle differences. This puzzle has following rules:

A puzzle has a 9x9 grid
Each row and each column must be filled with numbers 1 to 9; no duplicate numbers in a row or a column
Neighboring cells cannot have neighboring numbers.
- Left, top, right or bottom numbers around a cell cannot have numbers +1 or -1 of the number in the cell.
- For example if a cell has value 5, none of the left, top, right or bottom cells can have numbers 4 or 6.
- Neighboring numbers for 1 will be 2 and 9, and for 9 will be 1 and 8.
- Following is a list of neighboring numbers:
  1=2 and 9; 2=1 and 3; 3=2 and 4; 4=3 and 5; 5=4 and 6; 6=5 and 7; 7=6 and 8; 8=7 and 9; 9=1 and 8

Like Suduko, this puzzle can be rather difficult to solve. This program helps you solve existing puzzles as well as create new ones.
This program helps you solve existing noneighbors puzzles as well as create new ones. Main features of this program are:

Create new puzzles manually or automatically; automatic creation offers puzzles with different levels of difficulty
Solve existing puzzles manually
Create new puzzles one at a time or in bulk
Save puzzles as Ascii or bitmap files
Print puzzles and solutions
20,000 puzzles with solutions Download

nSequence

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Version 1.0
Updated 4 July 2008

Help

You are required to adjust a series of numbers to be in sequence. Numbers are adjusted by taking away 1 or 2 from one cell and transferring to another. A numbers in a cell must be taken away only once. However, numbers can be added to a cell more than once. 20,000 puzzles with solutions are provided with this program.

How to Play

During play you try to sequence the numbers by taking away and adding numbers from one cell to another:

A puzzle will comprise 4 to 10 cells.
Cell numbers must be adjusted to number 1 at left increasing by one to number N at right, where N is the number of cells
Left click on a cell, move mouse over to another cell and left click again. Source cell value will be reduced by one and target cell value increased by one.
Right click on a cell, move mouse over to another cell and left click again. Source cell value will be reduced by two and target cell value increased by two.
A cell value can be reduced by one or two, and once only
A cell value can be increased multiple times
All cells must be used

Program Options

Save and reload puzzles
Create puzzles with random or selected number of cells
Set display colour schemes
20,000 puzzles with solutions Download
Set display colour schemes

nSeq2D

Download now
Version 1.0
Updated 13 July 2008

Help

You are required to adjust a series of numbers to be in sequence. Numbers are adjusted by taking away 1 from one cell and adding it to one of its neighbouring cells. A numbers must be added to a cell once only. However, numbers can be removed from a cell more than once. 20,000 puzzles with solutions are provided with this program.

How to Play

During play you try to sequence the numbers by taking away and adding numbers from one cell to another:

A puzzle will comprise 3x3 to 9x9 grid
Each cell has a random number, maximum number being the grid size
Cell numbers must be adjusted such that row 1 of the grid has number 1 in all columns, 2 in row 2 and n in the last where n is the grid size. For example in a puzzle of size 7x7 the last row must have 7 in all columns.
Left click on a cell, move mouse over to a neighbouring cell (left, top, right or bottom) and left click again. Source cell value will be reduced by one and target cell value increased by one.
A value can be added to cell only once while values can be deducted multiple times
A value must be added to each cell in the grid

Program Options

Save and reload puzzles
Create puzzles with random or selected number of cells
Set display colour schemes
20,000 puzzles with solutions Download
Set display colour schemes

nTangle

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version 1.0
Updated 23 January 2007

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Welcome to nTangle: Untangle a web of intersecting lines, from very easy to very hard. A simple and relaxing way to pass your time.

Download More than 20,000 puzzles with varying level of difficulty

This is how you play:

Set the number of nodes (8 to 128) and click Generate, a new tangled puzzle will be created
Click and drag each node, tangled lines connected to the node will move
Reposition the nodes to untangle lines

The following program options are provided:

Specify puzzle size: fixed, range, above or below a specified number of nodes
Create new puzzle, each puzzle is unique
Create multiple puzzles and save to a file
Append new puzzle to existing puzzle files
Save new puzzles, 20,000 puzzles are provided with this program
Load new puzzle files
Select a puzzle to tackle from a file
Zoom in and out of tangled lines to get more space to work with
Adjust puzzle location to focus on a specific area of a puzzle
Get status of untangled lines; shown in green
Set different color schemes
Adjust the size and color of dots and lines
Let computer untangle a puzzle
Undo your moves
See bubble help for different command buttons

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NumberLink

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Version 1.0
Updated 30 May 2008

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Number Link is a Japanese logic puzzle published by Nikoli (2006).
The player has to pair up all the matching numbers on the grid with single continuous lines (or 'paths'). The lines cannot branch off or cross over each other, and the numbers have to fall at the end of each line (i.e. not in the middle). All cells must be filled with line and there is only one unique solution for a puzzle. Fans of Sudoku, Kakuro, Hashi and the like are sure to find this logic puzzle a refreshing challenge! 20,000 Puzzles provided with this program have unique solutions. Program handles puzzle size 5x5 to 16x16.

Generally NumberLink puzzles are rather easy to solve - size 8x8 and below in particular. Nevertheless they are good fun to try. This program will generate puzzles that have unique solutions. Caution - puzzle size 12x12 and above may take some time to generate.

How to Play

Normally you would print a puzzle and solve it on paper at your leisure. You can also connect numbers on screen using the following commands:

Leftclick mouse on a cell and drag mouse to the new location
Release leftclick to draw a line
A line can only be vertical or horizontal
Can draw a line in many horizontal and vertical segments if necessary
Cannot cross lines
Cannot draw a line through a number
Must connect same numbers together
Each puzzle has a unique solution

Program Options

Select line and number colours of your choice
Save and reload puzzles
Print puzzles and their solutions
20,000 puzzles with solutions Download
Set display colour schemes

Numgrid

Download now
version 1.0
Updated 12 July 2004

Help

In this game you are given a set of four numbers located at the corners of a 7 x 7 grid. You are required to fill the grid with numbers 1 to 9 and signs + - * to make the given four numbers.

How to play

Use left/right mouse buttons to place numbers and signs on the grid. You can print the puzzles, three puzzles and solutions per page.

The computer can also solve number grids. Under the Puzzle menu click 'Set a Puzzle for computer to solve'. Then set four numbers on the grid corners and click solve.

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nPairs

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version 1.0
Updated 20 March 2008

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In this game a set of 50 numbers (numbers 0 to 9 in five colours) are placed in 10 columns, 5 rows each. First 9 columns are the Working area. You are required to match and eliminate pairs from the working area. Game ends when all numbers have been removed. The tenth column is the Reserve area, a number can be moved any time from Reserve to Working area. Rules of the game are:

Rules:

A pair can be removed when:
- A number is adjacent to another, at: left, right, above, below, or diagonally adjacent
- Two adjacent numbers are of different colour
- Two numbers differ by one
- For example red 7 can be paired with black 6 or green 8. Nine can be paired with 8 or 0.
A number can be moved from Reserve column to the Working area, but in the same row
An entire row in the Working area can be shifted left or right eliminating all empty spaces, similarly
A entire columns in the Working area can be shifted up or down eliminating all empty spaces
After you eliminate pairs, you move rows and columns around in order to create possibilities for other pairs to remove
Game ends when all numbers have been removed
You can play this game with 3, 5, 7 or 9 columns working area with maximum number being 3, 5, 7 or 9 respectively. Same rules apply including the rule that the maximum number can also be paired with 0.
Score is maintained only for the most difficult 9-column game

How to play:

Left click and drag-drop a number to the paired number. Both numbers will be removed if they are a valid pair.
In order to shift a row left, click on the board left to the start of the row
In order to shift a row right, click on the board right to the end of the row
In order to shift a column down, click on the board below the start of a column
In order to shift a column up, click on the board above the end of a column
Right click on a number in the Reserve column. The respective row will be moved left and the number will be moved to the first empty space in the row
Resize window to increase or decrease number size
Use Options to set number of columns, and fonts and colours of your choice

mindGames

an eclectic collection of games to pass the time and challenge the mind

Navigation

Math games

2OrDie

Program Features

beeHive

How to Solve

Program Features

CircuSum

Program Features

Connect

How to Play

Program Options

CrosSequence

Program Features

DigiDots

Program Features

Equator

Program Options

Fillomino

How to Solve

Program Features

FlipFour

FourSum

Program Features

FourSumSuper

Program Features

FutoShiki V2

GearUp

Hashiwokakero

HexaNum

Program Features

Hexoku

How to Play

Program Features

Heyawake

Hitori

Kakuro

Lineup123

How to Play

Program Features

LatinLink

Terminology

Objective

How to Solve

How to navigate

Program Features

LatinOrder

How to Play

Program Features

Make9

Magicsquare

Makenum

Masyu

Mathdoku

Terminology

Objective of the Game

How to Solve

How to navigate

Program Features

MathiX

Using Clues

Program Options

MathWay

How to Play

Main features of this program are:

MoreorLessSudoku

How to Play

Program Features

nashE

nDrop

How to Play

NineMath1

Program Features

NineMath2

Program Features

nLock

How to Play

noneighbors