Cheat mode:
Have ZED collect the Megaton Bomb from the Idol Room and exactly 62 bombs. Then have ZED destroy a Spider Lurcher with the regular weapon and make position him so he is facing down. Press Select to display the "Sub Screen" and highlight the Energy Capsule. Hold Up/Left on controller two and press A(2) on controller one to enable cheat mode. ZED will now be able to use an unlimited quantity of any item.

Level select:
Enable cheat mode, then press Up/Left + Select. A number that corresponds to a game level will appear. Press the A or B select a new level.

Disable collision detection:
Press Start to pause game play. Hold Select + B and press Start to resume game play. ZED will be able to move through objects as long as Select + B are held.