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Legend of Galahad (Genesis)
RYBA-E604
Press the Jump button to slowly fly upwards. Press Jump button again to drop back down. You can control your character while flying. Press and hold Jump button for normal jump. You can also walk off ledges without falling (walk on air).
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Legend of Galahad (Genesis)
B6HT-AAE8
Can select up to 15 lives in the Option menu. Only works on "Normal" difficulty. Note that "?" = 15 lives.
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Bonanza Bros. (Genesis)
RZ0T-C612
Guards can't see you. Note that guards will hear you if you kick the soda can.
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Bonanza Bros. (Genesis)
AC0A-CA2R
Walk thru doors without opening them.
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Bonanza Bros. (Genesis)
AL5T-AA46 +
AL5T-AA6G
Walk thru walls. Note that if you need to go up a flight of stairs, you have to either jump up, or turn the code off.
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Sonic & Knuckles or S&K with Sonic 3 attached (Genesis)
C2NT-CA82
Can become Super Sonic at any time by doing a double jump. Add this code to make it so no rings are subtracted while you're Super Sonic: RYPT-C6X0.
RYPT-C6X0
No rings are subtracted when you are Super/Hyper Sonic or Knuckles.
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Sonic & Knuckles or S&K with Sonic 3 attached (Genesis)
C36A-CA4R
Can become Super Knuckles at any time by doing a double jump. Add this code to make it so no rings are subtracted while you're Super Knuckles: RYPT-C6X0.
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Sonic & Knuckles or S&K with Sonic 3 attached (Genesis)
C36A-CA4R +
RF6A-C61W
Can become Hyper Knuckles at any time by doing a double jump. Add this code to make it so no rings are subtracted while you're Hyper Knuckles: RYPT-C6X0.
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Sonic & Knuckles or S&K with Sonic 3 attached (Genesis)
BBYT-CA7N
Anytime Knuckles lands on a wall, the ground shakes killing all enemies on screen.
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Sonic & Knuckles or S&K with Sonic 3 attached (Genesis)
RENT-C6T8 +
AANT-CA3A
Double jump to make Sonic do a Super Glide and kill all enemies on screen. Sonic will glide all the way across the screen at full speed and hit the ground running. Any enemies on the screen will die.
EDIT: Forgot a small detail... This code also kills all enemies on the screen. Updated code description.
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Sonic & Knuckles or S&K with Sonic 3 attached (Genesis)
C2NT-CA82 +
REPA-C6WC
Can become Hyper Sonic at any time by doing a double jump. Add this code to make it so no rings are subtracted while you're Hyper Sonic: RYPT-C6X0.
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Virtual Pinball (Genesis)
F67T-RLHE
All 16 hidden games are available to play in the "Game" option.
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Sonic & Knuckles or S&K with Sonic 3 attached (Genesis)
BALA-B72N
Pause the game to enable debugger (alternate version). When you unpause, you'll be a ring and can move anywhere in the level using the directional pad. Press A to cycle thru objects, press C to place objects, press B to exit debugger and return to normal game-play. You'll need to pause the game again if you want to re-enter the debugger.
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Joe & Mac (Genesis)
BVCT-AADR
Only take half as much damage from most attacks. Note that the life bar may sometimes act funny, but should not affect gameplay.
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Joe & Mac (Genesis)
TCCT-AAEW
Invincibility lasts twice as long after you're hit.
ACCT-AJEW
Invincibility lasts 10x as long after you're hit.