Insert the following codes into the password screen.
FDAIFKOE All 18 levels and 7 hearts.
ANALAHOJ All 18 levels, 3 boss levels,5 hearts and 31 men.
TWISTEYE Hold L1 and L2 and move the d-pad to the left and the right to rotate the screen. Press DOWN to restore it.
THE THING Hold L2 and press Circle to get circled.Press Cross to get normal again.
HARDBODY Invisible.
BODYSWAP Press T to change the gender of the persons in the mid-game.
OTTOFIRE Permanent weapon.
VITAMINS 31 lives.
CORONARY Extra hearts.
BORNFREE Go to each world.
TOMMYBOY Complete a level plus a pinball bonus game.
CASHDASH Complete a level plus a bonus level.
By using the password INANDOUT, you'll be able to quit to the level map instead of the main menu. If you press the Right button after returning to the map, you'll be able to move to the next level, even if you haven't completed the previous one. Returning back will nullify the glitch.