Web Sudoku

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Difficulty

Time Elapsed

Input Mode

Ready to Play?

Select Your Difficulty:

Easy

Medium

Hard

Very Hard

Ridiculous

How to Play

Sudoku is played on a grid of 9 x 9 spaces. Within the rows and columns are 9 "squares" (made up of 3 x 3 spaces). Each row, column and square (9 spaces each) needs to be filled out with the numbers 1-9, without repeating any numbers within the row, column or square.

Keyboard and Mouse Input

Mouse, Key	Action
Mouse click	Select a square
Cursor Keys	Move the selected clear
1-9	Play that value in the selected square
SHIFT + 1-9	Toggle a guess tick in the selected square
Space, Delete, or Backspace	Clear the value in the selected square
SHIFT + Space	Clear (or Set) all guess ticks in the selected square
T	Toggle between "Guessing Mode" (playing a value) and "Candidate Mode" (placing a tick mark)