One day, I just really wanted to play Tetris. So, I go into the AppStore and I look it up. I download the official Tetris Apps. There all garbage, covered with ads, and one even froze when I lost! Then I stumbled across this game. This is just Tetris, no gimmicks, no online, just Tetris. I really liked that, and it supported Game Center! It may not look all that great, but ClearBlocks is better than the rest.