![ice age 2 the meltdown speedrun ice age 2 the meltdown speedrun](https://cdn.thegamesdb.net/images/medium/boxart/front/68534-1.jpg)
While most of Mario's abilities are taken directly from Super Mario 64, such as the long jump, wall jumps, and a variety of somersaults, Mario is given new moves that take advantage of the Wii Remote's pointer and motion sensing. The player's character is controlled via the Wii Remote and Nunchuk. Once 120 Power Stars are collected with both characters, the player is rewarded one additional challenge for Mario and Luigi to complete, as well as two commemorative pictures that can be sent to the Wii Message Board upon each brother completing the challenge. When 120 Power Stars are collected, the player gains the ability to play through the game again as Mario's twin brother Luigi. Gameplay is slightly different while playing as Luigi, as some obstacles can be harder or easier to overcome due to Luigi's higher running speed and lower traction. However, as more Power Stars are collected, more galaxies become available to the player. When the player first begins the game, access is available to only a few galaxies.
![ice age 2 the meltdown speedrun ice age 2 the meltdown speedrun](https://cdn.thegamesdb.net/images/medium/boxart/front/10737-1.jpg)
Five of the domes end with a boss level in which the object is to defeat Bowser or Baby Bowser, which then allows the player to access the next dome. The game's main hub is the CometObservatory, a spaceship which contains six themed domes that provide access to the forty-two galaxies available in the game. Super Mario Galaxy allows the player to fully circumnavigate small planets. Though the main gameplay is 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. The player can usually jump from one independent object and fall towards another one nearby. Super Mario Galaxy is set in outer space, where Mario travels from galaxy to galaxy in order to collect Power Stars, which are earned by completing levels in 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 for a unique feature: each celestial object has its own gravitational force, allowing the player to completely circumnavigate rounded or irregular planetoids, walking sideways or upside down.