If Tetris blocks had strange leering faces, and the game was about building up the blocks rather than eliminating them, you’d get Topple. Topple has a relaxed, low-gravity feel about it and your block-tower is sensitive to tilting your iPhone. While the game starts off chilled, it increases in tension as your tower grows taller and less stable. There’s a standard level-unlocking mode, free play and a brand new ‘Space’ mode which doesn’t impose a time limit on you. You can’t ask for much more from a free game.