Nintendo Wii :: Super Mario Galaxy Cheat Codes
Play as LuigiCollect all 120 Stars. Then, go to Rosalina on the Comet Observatory, and request to fight Bowser again. Defeat Bowser to view an alternate ending. Once the credits finish, you will get a message saying Luigi is now playable. Luigi is just like Mario, but he jumps higher, runs faster, and has lower traction.
Grand Finale Galaxy
Collect all 120 Stars with Luigi, and defeat Bowser to unlock the Grand Finale Galaxy for both Mario and Luigi, which is the Star Festival seen in the beginning of the game.
Star 121
Collect 100 Purple Coins in the Grand Finale Galaxy to get the final Star.
Watermelons instead of coconuts
Collect 9,999 Star Bits in the Hub to change all coconuts in the game to watermelons.
View number of lives lost
Collect the final star in the Grand Finale Galaxy with both Mario and Luigi. The information from your saved game file will now include the number of times you lost a life.
Flying Mario
To get flying Mario, you need to get the sixth Grand Star that will open two new domes, "The Garden" and "The Gate". Enter "The Gate" dome, and talk to the red Luma that gives you a challenge to get all 100 purple coins. He will give you a red star that makes you fly after you spin in midair. After finishing that challenge, the same red stars will appear in the observatory to make Mario fly.
Homing attack
Spin in mid-air, then immediately press Z to hit the nearest target.
Assistant
While playing the game, use a second Wii-mote. Although a second player will not appear, the second Wii-mote will have its own pointer, allowing another player to assist by collecting items and helping Mario's jumps.
Quick start when racing Cosmic Mario in Honeyhive Galaxy
Before the race begins, hold Forward. Press Z when the timer reaches "2", then press A when the race begins. If done correctly, Mario will turn yellow briefly and get a quicker start.
Pokemon reference in Buoy Base Galaxy
In Buoy Base Galaxy, above the tower where you collect the Blue Star Pieces, is a little planetoid that is a sphere with two red panels on top and a lighter bottom with a screw in the middle. It looks exactly like a Pokeball.
Pikmin reference in Space Junk Galaxy
One of the planets is shaped like Captain Olimar's rocket ship that appeared in Pikmin and Pikmin 2.
Bonus stages (demo version)
At the main menu, hold 1 + 2 and press A + B to access two hidden stages.
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