Super Mario Galaxy is set in outer space, where Mario goes from galaxy to galaxy collecting star power, which can be earned by completing galaxies or defeating enemies. Each galaxy contains a number of planets and other space matter for the player to explore. The game uses a new physics system that allows a unique feature: each celestial object has its own gravitational force, allowing the player to completely round the planet, round or irregular, go horizontal or upside down. The player can usually jump from one independent object and fell on some nearby. Although the game is in 3D, there are some areas in the game in which the player's movements are restricted to a 2-dimensional plane, an element reminiscent of 2D Mario games.
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