Even iPhone and iPad app developers must be knee-deep in World Cup coverage, because apps that have gone free are few and far between.  Still, we at least have a few gems to inform you about, including the award-winning iBlast Moki . iBlast Moki ($.99 -> Free): A physics-based puzzle game where you must get your character from one end of the level to the other by using the limited tools at your disposal.  The game features adorable graphics, realistic physics, 85 levels, seven worlds, a level editor with the ability to share your own levels online, and Plus+ integration.