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About

 

For Teachers

Translations

Software Requirements

SoftwareRequirements


Android iOS Windows MacOS
with best with Chrome Chrome Chrome Chrome
support full-screen? Yes. Chrome/Opera No. Firefox/ Samsung Internet Not yet Yes Yes
cannot work on some mobile browser that don't understand JavaScript such as.....
cannot work on Internet Explorer 9 and below

 

Credits

Fremont Teng

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Sample Learning Goals

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For Teachers

 
Sudoku(数独 sūdoku, digit-single) (/sˈdk//-ˈdɒk-//sə-/, originally called Number Place)[1] is a logic-based,[2][3]combinatorial[4]number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.
(From Wikipedia)

Instructions

Step 0: Generating the Sudoku

Don't like the sudoku generated?
 
 
Click on the reset button for a new one.
All our sudokus are randomly generated and solvable,
so do not worry about encountering any unsolvable sudoku.

Step 1: Select the Difficulty of the Sudoku

This can be done by toggling the Numbers to Hide (blue) slider.


(Default)
 
 Moving to the left will reveal more numbers, giving easier difficulty.
(Moving the slider to the left)
 
While moving to the right hides more numbers, giving higher difficulty.
(Moving slider to the right)
 
Note that after Step 2, you won't be able to manipulate this slider anymore.
 

Step 2: Select a Number

You need to pick a number from the blue list on the left of the sudoku board.
 
(Default - List of Blue Numbers)
 
Clicking from the list will highlight the selected number with yellow.
(3 is clicked upon)
 
In this case, the number selected is 3. You are now equipped with that particular number.
This can be further checked on the top left hand corner of the screen.


(Top Left hand corner of the screen)
 

Step 3: Fill the Empty Slots

 
Throughout the sudoku there are empty cells waiting to be filled.
 
If you have a number selected, clicking on the empty slot will fill it with that particular number.
It also will highlight that particular slot with yellow.
 
(3 is placed wrongly in the cell)
 
Filling the wrong number into the cell will give it a red.
 
(1 is placed correctly)
 
While filling in a right number will make the number green
 
Note that after filling in a right number, that particular cell will become unselectable.
 

Step 4: Fill up the Rest of the Sudoku

 
Filling up all the remaining slots correctly will show you a completion message.
This will also display to you the number of tries to finish this Sudoku piece.
 

Miscellaneous

Sudoku Solution

Stuck in the Sudoku?
Feel like giving up or just want to see the solution?
 
Clicking on this button will automatically solve the Sudoku for you,
showing you the answers to the piece.
 

Information Texts

Displays to you the remaining cells left to fill.


Displays to you the number of tries you have made.

Toggling Full Screen

Double click anywhere in the panel to toggle full screen.

Research

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Video

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 Version:

Other Resources

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