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Sonic the Hedgehog 2 (revision 01) - Game Genie codes:

ACLA-ATD4	EHZ on level select leads to Hidden Palace Zone
ACLA-AECY	DEZ on level select leads to Wood Zone
SAST-DJ1A	Rings worth 2--player 1
SAST-DY1A	Rings worth 5--player 1
SAST-DA1A	Rings worth 8--player 1
AE8A-AAD2	Start with 1 life instead of 3--player 1
AY8A-AAD2	Start with 5 lives--player 1
A68A-AAD2	Start with 7 lives--player 1
BE8A-AAD2	Start with 9 lives--player 1
DE8A-AAD2 	Start with 25 lives--player 1
GJ8A-AAD2 	Start with 50 lives--player 1
KN8A-AAD2 	Start with 75 lives--player 1
NN8A-AAD2 	Start with 99 lives--player 1
JW3A-CA4J 	Infinite lives--player 1
SATA-DJVW 	Rings worth 2--player 2
SATA-DYVW 	Rings worth 5--player 2
SATA-DAVW 	Rings worth 8--player 2
AE8A-AAD8 	Start with 1 life--player 2
AY8A-AAD8 	Start with 5 lives--player 2
A68A-AAD8 	Start with 7 lives--player 2
BE8A-AAD8 	Start with 9 lives--player 2
DE8A-AAD8 	Start with 25 lives--player 2
GJ8A-AAD8 	Start with 50 lives--player 2
KN8A-AAD8 	Start with 75 lives--player 2
NN8A-AAD8 	Start with 99 lives--player 2
JXGA-CA7G 	Infinite lives--player 2
KBVT-CAE2 	Jump lower
FVVT-CAE2 	Jump a little higher
EBVT-CAE2 	Jump a lot higher
CBVT-CAE2 	Jump really high
A02T-CAF8 	Sonic stays invincible for a shorter time after getting hit
982T-CAF8 	Sonic stays invincible for a longer time after getting hit
ALTA-CA8N 	Sonic becomes invisible and invincible after getting hit
ALTA-CA9J 	Once invincible (stars), Sonic stays invincible for the rest of the level
ATTT-CA4W 	Sonic doesn't lose rings when hit
ATTT-CA5G	Tails doesn't lose rings when hit
AH2T-CAH6	Sonic needs only 1 ring instead of 50 to enter the Special Stage

With the following codes, the counter won't show extra rings, but you do get them.
SBJA-HJWJ	Rings worth 2 in special stages--Sonic
SBJA-HYWJ	Rings worth 5 in special stages--Sonic
SBJA-HAWJ	Rings worth 8 in special stages--Sonic
SBJA-HJWR	Rings worth 2 in special stages--Tails
SBJA-HYWR	Rings worth 5 in special stages--Tails
SBJA-HAWR	Rings worth 8 in special stages--Tails

Starting level modifier:

9T8A-BCRG 
xxxx-xxxx (see below) 
CA8A-B78L 
RE8A-A60N 

These are the possibilities for the second code (xxxx-xxxx):

AA8A-AAGJ	Emerald Hill 1 
AE8A-AAGJ	Emerald Hill 2 
AA8A-ACGJ	Level 01 1 
AE8A-ACGJ	Level 01 2 
AA8A-AEGJ	Wood 1 
AE8A-AEGJ	Wood 2 
AA8A-AGGJ	"Dust Hill" (03) 1 
AE8A-AGGJ	"Dust Hill" (03) 2 
AA8A-AJGJ	Metropolis 1 
AE8A-AJGJ	Metropolis 2 
AA8A-ALGJ	Metropolis 3 
AE8A-ALGJ	Metropolis "4" 
AA8A-ANGJ	Wing Fortress 
AE8A-ANGJ	Wing Fortress "2" 
AA8A-ARGJ	Hill Top 1 
AE8A-ARGJ	Hill Top 2 
AA8A-ATGJ	Hidden Palace 1 
AE8A-ATGJ	Hidden Palace 2 
AA8A-AWGJ	Level 09 1 
AE8A-AWGJ	Level 09 2 
AA8A-AYGJ	Oil Ocean 1 
AE8A-AYGJ	Oil Ocean 2 
AA8A-A0GJ	Mystic Cave 1 
AE8A-A0GJ	Mystic Cave 2 
AA8A-A2GJ	Casino Night 1 
AE8A-A2GJ	Casino Night 2 
AA8A-A4GJ	Chemical Plant 1 
AE8A-A4GJ	Chemical Plant 2 
AA8A-A6GJ	Death Egg 
AE8A-A6GJ	Death Egg "2" 
AA8A-A8GJ	Aquatic Ruin 1 
AE8A-A8GJ	Aquatic Ruin 2 
AA8A-BAGJ	Sky Chase 1 
AE8A-BAGJ	Sky Chase 2