Correctly insert the Super Mario Galaxy Game Disc into the disc slot on your Wii console. The power on the Wii will turn on.
When playing from the beginning, you'll want to create a save file. When playing for the first time, choose a planet where you want to create your save file. When you create a file, you will return to the file-selection screen. Creating a file requires one free block of space in your Wii system memory. You can also mark your save file with a Mii stored in your Wii system memory.
From the file selection screen, choose a save file (planet) to play, and select "Play with this File" to continue from a previous save. Also, you can point at the P2 Star Pointer and press
to display two-player controls.
After completing a stage, you have the option to save your progress. Once data is erased, it cannot be restored, so please be careful. When you restart the game, your lives will be reset. See your Wii System Operations Manual for more information about how to erase files from Wii system memory.