500 Sudoku

500 Sudoku is an free and simple puzzle game. your objective is to enter a digit from 1 through 9 in each cell, in such a way that: Each horizontal row, vertical column and sub grid contains each digit exactly once. Features: - Easy input mode. - 500 free puzzles. Easy (130), Medium (130), Hard (130), Very Hard (100). - Game time and history. - Set checkpoint and back to it.