Play as Luigi
Collect 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.

Higher jumps
To jump even higher than a triple jump, first do a triple jump. At the peak of your third jump, spin. This will make you jump higher so you can reach things that are too high to reach with a triple jump.

Homing attack
Spin in mid-air, then immediately press Z to hit the nearest target.

Super ground pound
Note: For a better effect, do the following at a high angle. Jump and spin. As soon as you see the light, ground pound. Mario will do a cannonball, then slam on his legs with his hands in the air. This is more powerful than a normal spin.

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.

Sleeping Mario
Allow the game to idle for approximately one minute, and Mario will go to sleep.

Rosalina's bubble
Go to where Polara and Rosalina stand together by the beacon. Stand far enough away from Rosalina so that the talk sign does not appear. Then, try to jump on Rosalina. A bubble will form around her.

Flip the screen
Note: You must have the Engine Room dome unlocked. Go outside of the dome. Move slightly to the left, then jump off the platform, and slide down the curtain. After falling off the curtain, immediately Ground Pound and fall into space. A bubble will carry Mario or Luigi back up to the Engine Room. While he is going up, the screen will flip for about two seconds. Note: This may not work every time.

Pokemon reference 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.

Easy lives in Comet Observatory
At the Comet Observatory, run around and collect the 1-Up Mushrooms. Then, go into a Dome, come back out, and all the 1-Up Mushrooms will have respawned. Note: More 1-Up Mushrooms can be collected after you unlock the Red Star.

Defeating Cosmic Mario in Honeyhive Galaxy
When racing against Cosmic Mario, perform long jumps to reach the goal quicker.

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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