There are no official "shortcuts" in Mario Kart Wii in the sense of secret paths or hidden routes. The game is designed with a clear track layout for all players.
However, there are several techniques and strategies players use to gain an advantage, which may appear like shortcuts:
While these techniques might appear like shortcuts, they are all within the game's intended mechanics and require skill and strategy to master.
Therefore, there are no real shortcuts in Mario Kart Wii, but there are many ways to optimize your racing and outsmart your opponents!