Earthworm Jim 3D
 

Earthworm Jim gets squashed by a cow, leaving him dazed and confused. In the aftermath, his marbles go missing, so he must travel into his brain to find them and put everything right. All of the laughs are there from the original platform titles, but now in huge 3D worlds.

If you're anything like me, you can't stand Nintendo 64 3D graphics. Here's a nice-looking PC version of a N64 3D platformer. Great style and funny.