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Sonic the Hedgehog 1 (Japan) - Game Genie codes:

ATBT-AA32	MASTER CODE--MUST BE ENTERED
2E6T-BCHN	Invincibility
2E6T-BCR2	Start with more than 500 rings
CA3A-AA3E	Level select
AB7A-DAA6	"Press Start Button" message on title screen
XE3T-AABY	Start with 99 lives
G29T-CA5T	Infinite lives
AE3T-BA32	Start with 1 chaos emerald
AJ3T-BA32	Start with 2 chaos emeralds
AN3T-BA32	Start with 3 chaos emeralds
AT3T-BA32	Start with 4 chaos emeralds
AY3T-BA32	Start with 5 chaos emerlads
A23T-BA32	Start with 6 (all) chaos emeralds
9T6T-BAAN	No Zone title cards
TA6T-BDTT	Title cards don't disappear
JLYT-AA9A	Every monitor gives power sneakers
2E6T-BCS2	Debug mode