Kula World

Kula World (Roll Away in North America) is a 3D platform puzzle video game developed by Game Design Sweden AB for the Sony PlayStation, which places the player in control of a Kula beach ball. The main objective of the game is to collect keys which unlock the level exits, as well as coins and jewels along the way. The game makes use of alternative physics, changing the direction of gravity as the ball moves. (wikipedia.org)