Superman for N64 Cheats and Cheat Codes

At the main menu, press C-Up, C-Down, C-Left, C-Right. If you entered the code 
correctly, Clark will say "This looks like a job for Superman." Then, enter one 
of the following codes while the game is paused:


Level skip

Pause the game and press C-Up, C-Down.

Refill health

Pause the game and press Z, R.

Super speed

Pause the game and press R, Z.

Super punch

Pause the game and press L, Z.

Freeze breath

Pause the game and press Z, L.

Heat vision

Pause the game and press R, L.