Sudoku

Sudoku is a logic-based puzzle. It is a type of constraint satisfaction problem, where the solver is given a finite number of objects (the numerals 1-9) and a set of conditions stating how the objects must be placed in relation to one another. The puzzle consists of a 9×9 grid further divided into nine 3×3 sub-grids (also called boxes, blocks, regions, or sub-squares).

Recent changes:
Added leaderboards for each difficulty
Added support for tablet devices