A Bug's Life cheats and cheat codes for Nintendo 64

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.