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Sonic the Hedgehog 1 (Japan) - Pro Action Replay codes:

0039EC11C1	Invincibility
0039D831C1	Start with more than 500 rings
0032246010	Level select
017A1C1000	"Press Start Button" message on title screen
00333400XX      Start with XX lives
013F706036      Infinite lives
003338700X	Start with X chaos emeralds
00DC5800XX      XX gravity (38 for normal gravity)
00390C10FC	No Zone title cards
003910D180	Title cards don't disappear
00A9E06042	Every monitor gives power sneakers
0039F831C1	Debug mode

FFFE2100XX	Keep XX rings
FFFE1200XX	Keep XX lives
FFFE2400XX	Keep XX seconds on the clock
FFFE2300XX	Keep XX minutes on the clock
FFFF8500XX	Sound test always plays sound XX
FFFFFA0100	Debug mode
FFFE10XXYY	Zone / Act modifier
		XX =	00 - Green Hill
			01 - Labyrinth
			02 - Marble
			03 - Star Light
			04 - Spring Yard
			05 - Scrap Brain
			06 - Zone Zone
		YY =	00 - Act 1
			01 - Act 2
			02 - Act 3
			03 - Act 4 (Labyrinth Zone only)