Codes
Level Select
Pause the gam, then press A 16 times and for one more time for each level. For example, you must press A on first level 17 times, and 21 times on fifth level. This works only for the first run.
Sound test
Unplug the Zapper and plug the second controller. Now, on the player section screen press and hold Left+Up+B+A on controller 2. If done right, the sound test should appear. Press A+B to quit the sound test.
Game Genie Codes
ZOOTYTGZ Start with half ammo
AEUTLYZZ Infinite ammo
LEOVAYTA Fewer errors allowed
OXOTYNOK Infinite errors allowed
ZAUTLTPA Start at level 2
LAUTLTPA Start at level 3
GAUTLTPA Start at level 4
IAUTLTPA Start at level 5
GAKVYVAO Start with half health
GZVAYLSA Infinite health
Jimmy's Deals 