Complete Crash Course multiple times to unlock additional courses.
Unlock extra arenas for Pikmin's versus mode.
A second player can use a Wiimote to make the following changes in the corresponding single player game.
The last turn in level 10 just before the princess can be difficult to complete. There are two ways to get past this area. The first method is to perform a very quick dive off the left side and land on the platform below. Once there, whip back to the right to avoid falling off. It is now a straight shot to the flag. The second method is to slowly dangle your way off the right edge of the upper platform until the left wheel is on the upper platform and the right wheel/head are dangling below. You can now go off the left side and stick the landing. Both methods need precise timing.
Playing as the ghost in Luigi's Mansion, hold L/R or ZL/ZR shoulder buttons together at the same time to start magic charge. Ghost will become visible and cannot move. Once charge is complete, player will be prompted to release, making all flashlights temporarily run out of battery.
Rotate the controller 180 degrees in the Plaza. You can now control the camera with Left Analog-stick, and your movement will automatically be re-adjusted on the Right Analog-stick.