Mario Party 8 Cheat codes

Unlockable Characters and Maps
Blooper/Hammer Bro:You'll get one of these characters when you beat Star Battle with any character. For the second, beat Star Battle again with the first one you unlock
Bowser's Warp Orbit: Beat the Star Battle with any character

Minigame Wagon
When you beat Star Battle mode, you can buy minigames in the Minigame Wagon. This is helpful if you feel impatient to or if you do not want luck to try and and get a certain minigame for you on a game board.

Minigame wagon: Complete Star Battle mode once

Unlockables

Any Minigame: Buy 1 of the 72 minigames for 50 Carnival Cards at the Fun Buzaar's Minigame Wagon
Board Sounds: Buy-it for 50 Carnival Cards at the Fun Buzaar
Board-Related Carnival Figures: Buy 1 of the 12 for 30 Carnival Cards at the Fun Buzaar
Carnival Figures: Buy at least 1 Carnival Figure at the Fun Buzaar
Carnival Parade: Buy at least 1 Carnival Figure at the Fun Buzaar
Character Voices: Buy-it for 50 Carnival Cards at the Fun Buzaar
Chomping Frenzy: Buy-it for 50 Carnival Cards at the Fun Buzaar
Credit Roll: Buy-it for 100 Carnival Cards at the Fun Bazaar
Heckling Sounds: Buy-it for 50 Carnival Cards at the Fun Buzaar
Minigame Sounds: Buy-it for 50 Carnival Cards at the Fun Buzaar
Minigame-Related Carnival Figures: Buy 1 of the 12 for 30 Carnival Cards at the Fun Buzaar
Star Carnival-Related Carnival Figures: Buy 1 of the 6 for 30 Carnival Cards at the Fun Buzaar
Table Menace: Buy-it for 50 Carnival Cards at the Fun Buzaar
Test for the Best: Buy-it for 50 Carnival Cards at the Fun Buzaar
Very Hard Difficulty: Buy-it for 50 Carnival Cards at the Fun Buzaar