Go to Funky's in level 1. Get Diddy and stand on the right side next to the flower. Back up a bit and Chimpy Charge ito the wall.
If done right, you should go into the wall and be able to walk around on top of nothing.
Be careful though because if you go over a river or walkway you fall in.
You can also get to the only spot in the level that can be accessed by Lanky.
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