Mario Party DS:
Successfully complete Story mode to unlock the Expert CPU difficulty setting; Triangle Twister Puzzle mode; Sound Test options; and Boss Bash and Score Scuffle mini-games.
Successfully complete Story mode and the Study Fall, Short Fuse, Soccer Survival, Chips and Dips, and Trash Landing mini-games to unlock the Rocket Rascals mini-game.
Link to another Nintendo DS in the game in Party mode to unlock all mini-game.
Successfully complete Story mode. When the characters appear during the ending sequence, tap them with the stylus to make them jump.
Go to "Gallery", "Collection", then "Character Figures". Select a figure to view. Tap the figure with your stylus, and it will jump.
If you are one of the three versus the single person, use the following trick to win easily. When you are escaping (the left or right arrows), look at the player on the train's face. In the countdown near one, if his of her face is looking left or right, choose the opposite arrow. For example, left face is right arrow and right face is left arrow.
If an opponent lands on a Piranha Plant space, rapidly tap the Piranha Plant to make it spit fire. This will not always work, but you are more likely to make it spit fire if you tap it with the stylus.
Successfully complete the indicated task to unlock the corresponding badge:
Successfully complete the indicated task to unlock the corresponding trophy at the Gallery menu: