Successfully complete Story mode in addition to the Study Fall, Short Fuse, Soccer Survival, Chips and Dips, and Trash Landing mini-games.
Successfully complete Story Mode. Then, go to Party mode and select Tag Battle. Choose the teams and set your teammate to "Expert" and the CPUs to "Easy" or "Expert". Set your team handicap to three stars. Set the turns to 30. Select DK's Stone Statue. Then if you get first, you should earn up to 700 MP points.
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 hers 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.