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Grab a Bee Mushroom as the credits roll and wait for the Shiverburn / winter area. When the page flips, fly toward the screen before you land in the snow or even come in view. You should fall to your death. The screen will be black, and you'll hear sound effects from the credits. At the end, it says "THE END" with "TOO BAD" in the background.
Deposit star bits to change the Banker Toad's gear.
Beat The Perfect Run (the Comet for The Grandmaster Galaxy) to unlock a death count for your game on your save profile. It's probably pretty high.
When you are close to a Hammer Bro., do a long jump and spin. Mario will kick him down, then finish him of with another kick.
While on ice, press Z to skate backwards! It looks really cool!
Exit the game while playing as Luigi instead of Mario and you'll see his face on the title screen (as long as you chose Mario's for your default profile face).
This fantastic cheat will get you 99 lives easily -- you can always return for more! Go to the Supermassive Galaxy in World 4 and choose the first Star challenge. Play through the level until you get to the hockey puck-shaped planet with three supermassive Koopa turtles patrolling it. DO NOT grab the Spin Drill -- you'll have to get hit to lose it if you do! Run up behind a Koopa and long-jump (press Z while running and then press JUMP) onto its back. You need to long-jump from about a turtle-shell-length behind it to catch the "sweet spot." Continue to hold the analog stick to the RIGHT and hold JUMP to continually bounce off the Koopa's shell. If you fall off or hit the head, try again. If you hold these buttons you should be able to maintain momentum while constantly bouncing on the shell. After a few bounces you'll rack up 1-Ups for each hit.
Near the level list signpost on the main platform of Starship Mario is a Toad Banker who will store your star bits so other save profiles can use them. If you deposit 9999 star bits into the Toad Bank -- or just collect them in your "wallet" -- you'll unlock the Grandmaster Galaxy Daredevil Run.
This tricky move, when perfected, can allow you to reach untold heights and explore off-limits areas. Jump and hold A to "flutter." As Yoshi flutters, TAP Z while still holding A and then release A quickly. Press A again to flutter jump again in MID AIR. The goal is to get Mario to duck, NOT dismount, then quickly flutter again. Try to catch Yoshi at the height of each flutter to perform this maneuver.
Perform the following actions to win the image of a crown next to your save profile.
Collect 120 Stars to see an alternate ending cutscene with Rosalina reading to Lumas and discussing Green Stars.
In co-op mode, player 2 can press any button to make wacky sound effects! UP, DOWN, LEFT, AND RIGHT will make sound effects on the 1st player's Wii-Mote while -, +, 1, and 2 will make sound effects on the 2nd player's.
Beat World 6 and you'll view the game's ending ... but it's not over yet! You'll unlock an entire new world, World S, as well.
Collect 240 Stars (120 Gold + 120 Green) to unlock the Grandmaster Galaxy in World S. This 2D level will test your Yoshi tongue-slinging skills. It has a Comet Medal and a single Star to collect, pushing your star count to a whopping 241 Stars!
Beat a level using Luigi to unlock a "ghost" recorded by the game's developers. You can try and beat this ghost as it makes its way through the level at mach speed!
Get "The Flotacious Blimp Fruit" Star in the Tall Trunk Galaxy to unlock Luigi for play on certain levels. You can talk to Luigi at the start of a level to control him. Complete the level and you'll unlock a time trial "ghost."
Complete the game after you get the 120 gold stars and you'll unlock 120 more green stars to collect!
Jump, shake the Wii-Remote to spin and QUICKLY press Z to perform a super ground pound. This move will allow you to hone-in on enemies below you; a heat-seeking butt-stomp, if you will.
You can collect several 1-Up Mushrooms on Spaceship Mario. As you collect stars, the following 1-Up options will appear on Spaceship Mario.