Nightmare Creatures - Platform: Nintendo64

Cheat mode
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Enter one of the following passwords, then choose the "Start" option 
to display a cheat menu with unlimited lives, play as monster, and 
level select options:

C-Down, Up, C-Up, C-Left, C-Up, Left, C-Down, C-Left
C-Down, Up, C-Up, C-Left, C-Right, Left, C-Left, Up
C-Down, Up, Left, Down, Down, C-Left, C-Left, C-Right
Left, Up, C-Down, C-Left, C-Right, C-Up, C-Left, Down
C-Down, Up, C-Up, C-Down, C-Up, Left, C-Up, C-Right.