Pro Action Replay Codes:
Strange Noises - 00D7F7:00 -Datel
Infinite Shields - 00D2D6:28 -Datel
Infinite Sneakers - 00DC0A:02 -Datel
Changes The Music - 00DC31:FF -Datel
Infinite Lives - 00D240:09 -Viper187
Infinite Time - 00D2D0:00 -Mez
Freezes The Time - 00D2D1:06 -Datel
Infinite Rings - 00D2A9:98 -Viper187
Invincibility - 00D209:01 -King of Chaos &/or Rid
Have All Chaos Emeralds - 00D279:06 -King of Chaos

Game Genie Codes:
Sonic The Hedgehog (U) (V1.0) [!]
Infinite lives - 007-01A-3BE -Galoob
Rings worth 2 points - 020-54A-E6E -Galoob
Rings worth 3 points - 030-54A-E6E -Galoob
Rings worth 4 points - 040-54A-E6E -Galoob
Rings worth 5 points - 050-54A-E6E -Galoob
Rings worth 6 points - 060-54A-E6E -Galoob
Rings worth 7 points - 070-54A-E6E -Galoob
Rings worth 8 points - 080-54A-E6E -Galoob
Never lose rings - 3A0-21C-2A2 -Galoob
Stop timer - 003-F8C-3B7 -Galoob
Start with 1 life - 013-7DE-E66 -Galoob
Start with 5 lives - 053-7DE-E66 -Galoob
Start with 9 lives - 093-7DE-E66 -Galoob

Sonic The Hedgehog (U) (V1.1) [!]
Start on Green Hill Zone, part 2 - 003-8CE-5D4 + 013-88E-91A -Galoob
Start on Green Hill Zone, part 3 - 003-8CE-5D4 + 023-88E-91A -Galoob
Bridge, part 1 - 003-8CE-5D4 + Start on 033-88E-91A -Galoob
Bridge, part 2 - 003-8CE-5D4 + Start on 043-88E-91A -Galoob
Bridge, part 3 - 003-8CE-5D4 + Start on 053-88E-91A -Galoob
Jungle, part 1 - 003-8CE-5D4 + Start on 063-88E-91A -Galoob
Jungle, part 2 - 003-8CE-5D4 + Start on 073-88E-91A -Galoob
Jungle, part 3 - 003-8CE-5D4 + Start on 083-88E-91A -Galoob
Labyrinth part 1 - 003-8CE-5D4 + Start on 093-88E-91A -Galoob
Labyrinth part 2 - 003-8CE-5D4 + Start on 0A3-88E-91A -Galoob
Labyrinth part 3 - 003-8CE-5D4 + Start on 0B3-88E-91A -Galoob
Scrap Brain, part 1 - 003-8CE-5D4 + Start on 0C3-88E-91A -Galoob
Scrap Brain, part 2 - 003-8CE-5D4 + Start on 0D3-88E-91A -Galoob
Scrap Brain, part 3 - 003-8CE-5D4 + Start on 0E3-88E-91A -Galoob
Sky Base, part 1 - 003-8CE-5D4 + Start on 0F3-88E-91A -Galoob
Don't lose breath underwater - 2A2-86A-6E2 -Galoob