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Choose the game which best suits your experience level. You can play on easy, medium, hard, or expert.
Each board consists of a 9x9 grid of 81 squares.
Each column, each row, and each 3x3 grid of numbers can only have the numbers 1 through 9 in them a single time.
Puzzles begin with some of the numbers already entered as givens. Givens are black. You can use the location of these to deduce which numbers are placed where throughout the remainder of the puzzle.
Click on a cell to enter a number and that cell will turn green to indicate you have selected it.
Click on the number you want to enter there in the number pad on the left side of the game or using the associated number on your keyboard. Entering a number once will enter a small version of that number (for what you think it might be) and entering a number twice enters a large number, indicating you are confident that is the correct number for that square. Click the backspace button if you want to delete the number.
You can enter multiple small numbers in a square as temporary holders until you are certain which of them is correct.
Each day this game offers another level to play through for each board size. When you complete a level you can select another date from the left side calendar date selector, or if you do not like today's level you can pick another day.
The lower left corner of the game contains buttons to pause the game, undo a move, a problem solver verification tool which highlights incorrect moves you made, turn music on or off, turn sound on or off, and switch between normal and full screen game modes.
The [?] button which shows you how many mistakes you have made also highlights where the mistakes are located. You can use that feature an unlimited number of times.
If you prefer to play offline you can print out today's sudoku puzzles using the print button on the game's welcome screen.