LittleBigPlanet is the most fun I have had for ages on the PS3, let alone on any other game in general.
LittleBigPlanet requires you to control an avatar (known as a Sackboy), and either create your own platforming levels, or solve puzzles within a stage. LittleBigPlanet completely takes the geometery of platforming, and completely lends itself to the perception of the player, ultimately making LittleBigPlanet both the most relaxing and freeing gaming experience yet.
Visually, LittleBigPlanet is both highly creative, and incredibly good looking. LittleBigPlanet has a strong artistic essence towards it, some of it almost being Burtonesque, but still standing out as highly striking. LittleBigPlanet is a game that looks highly creative, but at the same time, a game that adds to the high escapist value of LBP.
LittleBigPlanet overall is a truly must have game. LittleBigPlanet is completely innovative, and arguably the finest next gen game so far.