Game: Tumbledrop

The iPhone certainly has seen more than its fair share of physics-based block games, but none of them explode with cuteness and lovable personality quite like Tumbledrop. For a game that started out as a free flash demo, this brilliantly simple and intensely fun puzzle game couldn't be possibly be any better suited for Apple's portable touch-screen platform. Sending smiling little block creatures tumbling to their watery doom with a tap of your finger is a disarmingly cheerful task.