I mostly play Words with Friends, with a couple of friends. The only other two I play are Roll the Ball, where you have to get the ball from point A to point B by arranging the blocks with channels in them, and Block Puzzle, which I initially thought was Tetris but I wasn't paying enough attention when I downloaded it! It's similar, except the pieces don't drop - you see three pieces at a time, and you can place them where ever you want. Same idea though, to make and eliminate lines.