Sudoku Puzzle a free and fun, logic-based, combinatorial number-placement puzzle.
The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or "sub-squares") contains all of the digits from 1 to 9.
The puzzle setter provides a partially completed grid, which typically has a unique solution.
Completed puzzles are always a type of Latin square with an additional constraint on the contents of individual regions.
CONTROLS: · 1-9: digits from 1 to 9; · space: clear the cell; · up, down, left, right arrows: move cursor; · click on the timer to pause the game.
