Easy coins
When rolling the dice, roll doubles, after using a mushroom for 10 coins.
Get coins and stars without playing.
Go into the warp pipe and select a 1 player game. Pick any board. Get all started and on the first turn press start. Go to controller settings, pick your character, press A and make it computer operated. Before the last turn begins press start, go to controller settings, pick your character and set it back to player 1. Then play the last turn and at the end of the game you get all the stars and coins without playing the game.
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.
Power Up Duel Partners
To power up your partners in a duel mode, get the same partner in the back and front. The Eternal Star will improve their stats (Example: 2 Snowmen will be awarded +1 attack each; 2 Thwomps will have decreased salaries).
Starting Partners
In Duel Mode, players start with these partners:
Mario- Koopa
Luigi- Goomba
Yoshi- Boo
DK- Thwomp
Wario- Bomb
Peach- Toad
Daisy- Sniffit
Waluigi- Pirahna
Unlock Stardust Battle Mini-game
Play story mode and complete it. After you beat the millenium star at the end of story mode, you will be able to play Stardust Battle in the mini-game room.