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Sonic the Hedgehog 2 (REV A)(Genesis)
9JKT-B97T
Pause the game to enable debugger. When you unpause, press B to activate debugger, press A to cycle thru objects, press directional pad to move objects around, press C to place objects, press B to play your new level. You'll also have infinite time. Only works with Sonic, or Sonic and Tails.
BEKT-B77T
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 test out your new level. Only works with Sonic, or Sonic and Tails.
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Sonic the Hedgehog 2 (REV A)(Genesis)
AK5T-AA26
Always get the Chaos Emerald in Special/Bonus stages.
ABLA-GAA8
Don't lose any rings when you hit the black spikes in Special/bonus stages.
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Sonic the Hedgehog 2 (REV A)(Genesis)
R1VT-C6TR
Don't fall when you walk off ledges (Walk on air). Press jump to drop down.
This code also works on slopes, etc. If you have any problems, pressing jump
usually fixes it.
NOTE: There are a lot of ledges and slopes in this game, so you'll spend a lot of time "Walking on air" with this code. Can sometimes disrupt the "Flow" of the game, but still a lot of fun to play around with.
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Sonic the Hedgehog 2 (REV A)(Genesis)
C3JT-GA2J
Get rings from anywhere in special/bonus stages. Note that you will also get the black spikes which cause you to lose 10 rings. Use the "Gain 10 rings" code to prevent that (FPLA-GNA6).
EDIT: This code can make it so that you're just a couple rings short of the required amount is some bonus stages, so probably best not to use it.
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Sonic the Hedgehog 2 (REV A)(Genesis)
REKT-A60A +
AJKT-AAGN +
FNKT-BBRR
Pause the game and press A for invincibility. Invincibility only lasts until you lose a life, finish a level, or pickup another invincibility in the game. Can re-enable invincibility at any time.
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Sonic the Hedgehog 2 (REV A)(Genesis)
REKT-A60A +
AJKT-AAGN +
FNKT-BBRR +
SALA-ANAA +
BJLA-AAAC +
EALA-B72E +
DYLA-B72L +
6TLA-AA2N
Pause the game and press A for invincibility, or press B or C to add 10 rings to your total. Can repeat for more rings, but if you go over 100, you won't get your extra life until you collect a ring while playing. Also, the invincibility needs to be re-enabled if you lose a life, finish a level, or if you pick up another invincibility.
EDIT: This is set-up so that anytime you press a button when paused, it will unpause itself to visually show that you pressed a button.
EDIT2: Also, I made it so that your ring count is updated so you will instantly see the extra rings.
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Sonic the Hedgehog 2 (REV A)(Genesis)
REKT-A60A
AJKT-AAGN
FNKT-BBRR
FTKT-AA8W
AALA-AYAC
NALA-BS2E
D2LA-AAAJ
NNLA-BS2L
6TLA-AA2N
DEKT-B790
R0ZT-C60G
ATKT-AA7N
Pause the game and press A to become Super Sonic. Super Sonic will jump higher, have faster acceleration, higher top speed, and be invincible. Also, your rings won't decrease from being Super Sonic. You'll stay Super Sonic until you finish the level or lose a life, but can re-enable it at any time.
EDIT: Had to add another code to fix a problem with the music stopping when you un-paused.
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Sonic the Hedgehog 2 (REV A)(Genesis)
REMT-C6ZT
Doors never close after you pass thru them (like the ones in Chemical Plant Zone)
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Sonic the Hedgehog 2 (REV A)(Genesis)
BCZT-CA4E
Can turn into Super Sonic at any time. Will only last until you run out of rings. Just press Jump to turn into Super Sonic.
BCZT-CA4E +
R0ZT-C60G
Can turn into Super Sonic at any time. Will last until you finish the level, or if you lose a life. Just press Jump to turn into Super Sonic.
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Sonic the Hedgehog 2 (REV A)(Genesis)
MAZA-CEDN
Invincibility/star power-up lasts half as long.
NAZA-CWDN
Invincibility/star power-up lasts twice as long.
AYYT-CAFC
Ring monitors add 5 rings (instead of 10).
DEYT-CAFC
Ring monitors add 25 rings.
NTYT-CAFC
Ring monitors add 100 rings.
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Sonic the Hedgehog 2 (REV A)(Genesis)
FPLA-GNA6
Gain 10 rings when you hit the black spikes in special/bonus stages.
FPLA-GNA6 +
AZLA-GAA8
Gain 50 rings when you hit the black spikes in special/bonus stages.
EDIT: These codes can cause the game to freeze in the bonus stages, so best not to use them.
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Had a problem with the "Get rings from anywhere in special stages" code. The code made it so that you also "hit" all of the black spikes. This made it so that you would be a few rings short in some of the bonus stages. Added a second code that lets you run right thru the black spikes without touching them. You don't bounce back, you don't lose any rings, you just run right thru them.
Sonic the Hedgehog 2 (REV A)(Genesis)
C3JT-GA2J +
G3HT-GA3T
Get rings from anywhere in special/bonus stages. Can also run right thru black spikes without bouncing back or losing any rings.
G3HT-GA3T
Can run right thru black spikes in special/bonus stages without bouncing back, or losing any rings.
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Sonic the Hedgehog 2 (REV A)(Genesis)
B52T-CA9W
Special/Bonus stages are always accessible. Anytime you pass a star post, the bonus stage will appear. Works even if you don't have any rings, or if you have all 7 emeralds. Note that if you enter a bonus stage with all 7 emeralds, you may lose your Super Sonic ability, but you cal always use the "Can turn into Super Sonic at any time" code to fix that.
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Syndicate (Genesis) PAR
FF53A6:0010
Almost infinite health 1st agent (Red). Can still die if hit by a car, etc.
FF53FE:0010
Almost infinite health 2nd agent (Green). Can still die if hit by a car, etc.
FF5456:0010
Almost infinite health 3rd agent (Blue). Can still die if hit by a car, etc.
FF54AE:0010
Almost infinite health 4th agent (White). Can still die if hit by a car, etc.
Only tested with Gens.
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Syndicate (Genesis)
ALTA-CA6T
Infinite Gauss Gun ammo.
