This code lets you play as a Koopa in Whomp's Fortress.
The code is called:
Play as a Koopa in Whomp's Fortress Star 1
Which is at my site at:
http://sites.google.com/site/jamesskingdom/Home/game-codes-by-james-s/super-mario-64-codes
Thanks for viewing and please have a look at my other videos.