Sudoku

Sudoku is a logic-based, combinatoric number-placement puzzle. The objective of the game 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 contains all of the digits from 1 to 9 without being repeated the same number in each row and column.

FEATURES:
- different difficulties levels(Easy, Medium, hard)
- hundreds of puzzles for each difficulty
- auto pencil mark (draft)
- auto-save your progress for each puzzle
- unlimited undo/redo
- selected cell highlight
- number highlight
- errors highlight
- input highlight
- timer