Game Genie Codes:
Sonic 1
Sonic 1 Japan
Sonic 2 Beta
Sonic 2 (rev. 00)
Sonic 2 (rev. 01)
Sonic 3
Sonic & Knuckles
Sonic 3 & Knuckles
Knuckles in Sonic 2

Pro Action Replay Codes:
Sonic 1
Sonic 1 Japan
Sonic 2
Sonic 3 / Sonic & Knuckles / Sonic 3 & K
Sonic 1 & Knuckles
SMS & GG Sonics
Somari (NESten Emulator Codes)