Miracle Star:
To become a miracle star, get about 8 S rankings on the board and duel maps. The picture of the character that became a miracle star will be on the mountain in the main area.

Getting the three mini-games:
To unlock the first one (Stardust Battle), beat the game on story mode. To unlock the second one (Dizzy Dinghies), play every non-secret mini-game. To unlock the last one (1-player Mario's Puzzle Party), get 1000 or more coins in Game Guy's Room.

Hidden Maps:
To get the Battle Royal Map Waluigi's Island and the Duel Map Backtrack for play in Party Mode, beat the levels featuring these maps in Story Mode.

Mt. Mariomore:
To get your character's face on the mountain, simply beat story mode with that character. You do NOT have to become the Miracle Star to do so.

Unlock Super Hard difficulty:
Beat the story mode with whomever you choose, on Hard difficulty. Now, you can select Super Hard difficulty in both Story mode and Party mode.

Gold Mt. Mariomore:
Gold Mt. Mariomore - Beat hard mode with all characters and with all S ranks.

Free Coins from Mushrooms:
If you use a Mushroom item, and hit the same number on both dice, you get a free 10 Coins.

Extra Names:
To make the computer choose your name, go to the file select screen, and start a new file. Select "Okay" but don't enter anything. Your name will become a classic Nintendo character's name!

No Music Glitch:
Either go to the mini game mode or get to it in story mode. Choose the mini-game M.P.I.Q. and make sure you choose to ''see the rules.'' You must choose practice. During the game pause when you hear no sound at all. Unpause and quickly press the R button to quit the mini-game. If done correctly the game will have no sound at all until you reset it.