Tower Bloxx is a great arcade-puzzle game by Digital Chocolate. It may be a little old today but still fun to play for hours!
Tower Bloxx is a concentration game and it needs high attention and reflexes as hard as steel. You should build towers by placing the blocks on end and try not to demolish your tower with a wrong-balanced placing. Controls are very simple: Just click the left mouse button on the right time while the block is swinging at the top of the screen.