2000 Sudoku by FlashGamesFan.com

ゲームの説明
Play our sudoku with 2000 levels (easy and hard)! Developed by www.flashgamesfan.com
How to play
Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9x9 grid so that each column, each row, and each of the nine boxes (also called blocks or regions) contains the digits from 1 to 9 only one time each. The puzzle setter provides a partially completed grid.