XZYTLO: The exploding bridge is "camouflaged"
XXLTLO+XXGTLO: Player 1 starts with laser gun (game map is altered).
XXPTLN: No enemies. Game may freeze.
IEIIXZ- No gun after death and tons of baddies
TEIIXZ- Bubble Weapon after death and tons of baddies
TOASTY- Disco BeeBop Mode
PEIIXY- Double Cracker Gun
PAIIXZ- Endless Loop
ISTVYX- 'R's give you a free man
SOEAGT- glitches game graphics
NULLYZ- glitches title screen graphics
ZVZEAA- sweet pause sound and different music and graphics glitches (lives look different)
KAGIPE- Always returns to pause mode (note: could be playable with NES advantages slow motion mode)
GIPEEE- No upper body and graphics glitch
LLLLLL- Sweet color scheme on the title screen
SVUSUV- Almost completly dark game.
PLEVOO- Enemies & bullets move super-fast.
GEEETO- Different music.
TYNAEO- Cool drum beat, bullets fly at you all the time, sometimes freezes.
UEVELI- Graphics scrambled, music is slower, will freeze sometimes.
LETALI- Cool music, (don't shoot square targets with the big red dots or it'll freeze).
LNVELS- Music is slower, all things die as you approach. (DON'T try to get the power ups or Mr. Freeze will get you. Just keep running forward. Can't pass level 1 for some reason).
UNTAIL- Music is set at a much lower tone. GGGGKE- Cool colors & graphics show up while walking.
SITSIT- You can skate! Hold down and to the right to move forward on your belly.
TUNEIN- Some music is missing.
VUNEIN- Shooting things cause different SFX, pause music is the sound of a boss blowing up, when you land from a jump there will be a boulder sound.
TUYAIN- Weird bleeps & sounds.
AUNEIN- More weird noises.
NOTAIN- More different noises.
YOTAIY- Spreader only fires one shot at a time, laser is wider and looks totally different.
PYETOO- Nothing shoots at you!
VNYAIY- Extremely weird bleeps.