Sudoku is a number based single player puzzle game that is played on a 9x9 grid.

The 9x9 grid is subdivided into nine 3x3 blocks. To complete the puzzle each Row, Column, and 3x3 block must contain the numbers 1 through 9 exactly once.

Each puzzle starts with a selection of placed numbers on the Grid called Givens. The placed Givens determine how the puzzle needs to be solved. There is only ever one solution to each Sudoku puzzle.

To place a number on the Grid tap an empty cell then select a number from the selection of numbers below the puzzle Grid. If the entered number is correct the empty cell will fill in with that number and play a pulse animation. If the number is incorrect then the empty cell will fill in with that number, but with a slash through it, then it will clear itself from the Grid. There are no penalties for entering incorrect numbers on the Grid.

Fill in the empty cells with the correct numbers until the entire Grid is filled in.