Super Mario Galaxy

Super Mario Galaxy is set in outer space,^[8] where Mario travels from galaxy to galaxy in order to collect Power Stars, which are earned by completing galaxies or defeating enemies.^[8] Each galaxy contains a number of planets and other space matter for the player to explore.^[8] The game uses a new physics system that allows for a unique feature: each celestial object has its owngravitational force, allowing the player to completely circumnavigate rounded or irregular planetoids, walking sideways or upside down. The player can usually jump from one independent object and fall towards another one nearby. Though the main gameplay and physics are in 3D, there are several areas in the game in which the player's movements are restricted to a 2-dimensional plane, an element reminiscent of 2D Mario games.^[9]