This is a demo of the game Multiplayer Doyu Sudoku, a multiplayer online Sudoku game. I have uploaded here just a simple version of the complete game, which is available on DoyuGames.com.

The complete version of DoyuGames is multiplayer and include several modes to play.
In the multiplayer mode, you can play Battle matches, where you play versus one single opponent on the same Sudoku. On the Race mode you play versus up to other 7 people to be the fastest to solve your Sudoku.
In the single player mode you can choose between Free and Evolution mode.

You have several difficulties: Very Easy, Easy, Medium, Hard and Expert.