best game on my tablet

Very recommendable puzzle game that can be played against the computer or against a friend. (Unfortunately only in one device)
Total players are possible up to 4 and there are 2 levels of difficulty, and 12 starting positions of the game.
So it comes as soon not be bored.
For any fan of puzzle games so a clear recommendation from me: This game is, at least on the tablet, a must.
(Could imagine me namely that the screen of a smart phone is a bit too small for such a game)