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Nintendo 64 - A Bug's Life cheats

Invincibility on the current level:
Hold Z + R + L, when you see the level description at the beginning 
of the level.

Select any stage:
Hold C-Up + C-Down + C-Left + C-Right + Z and press R while 
you are at ant hill.  If the code is accepted, you should see an 
arrow at the bottom of the screen.