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.