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View topic - Sonic the Hedgehog Game Gear (Version 1) Game Genie Codes

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  • Joined: 08 Feb 2010
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Sonic the Hedgehog Game Gear (Version 1) Game Genie Codes
Post Posted: Tue Jul 20, 2021 3:41 am
First off, awesome website! I've been following this site on and off since I was a teen using 56k dial-up, and I appreciate that it's still going strong today! (cable internet these days)

I got a Game Genie for my Game Gear and found codes for Sonic 1, and I discovered that there are 2 versions of this game with different codes for different things. I don't know why there are 2 versions of this game to begin with, but the V1 codes in the official Game Genie booklet are ring, life, and time modifiers. The V2 codes are to skip levels and to breathe underwater. The V1 codes work on my cartridge, but I want to skip levels......:S

So, I found and followed the info on the Game Genie dev page here and did some minimal ROM searching between both versions to discover what the equivalent codes of the V2 game are for the V1. I don't see anyone's posted them here, on sonicretro, or on tcrf, so here they are (including the original published V1 codes):

Sonic 1 Game Gear V1

007-01A-3BE Infinite lives
020-54A-E6E 1 ring is worth 2
030-54A-E6E 1 ring is worth 3
040-54A-E6E 1 ring is worth 4
050-54A-E6E 1 ring is worth 5
060-54A-E6E 1 ring is worth 6
070-54A-E6E 1 ring is worth 7
080-54A-E6E 1 ring is worth 8
3A0-21C-2A2 Never lose rings
003-F8C-3B7 Stop timer
013-7DE-E66 Start with 1 life
053-7DE-E66 Start with 5 lives
093-7DE-E66 Start with 9 lives

003-8BE-5D4 + Start on
013-87E-91A Green Hill Zone, part 2
003-8BE-5D4 + Start on
023-87E-91A Green Hill Zone, part 3
003-8BE-5D4 + Start on
033-87E-91A Bridge, part 1
003-8BE-5D4 + Start on
043-87E-91A Bridge, part 2
003-8BE-5D4 + Start on
053-87E-91A Bridge, part 3
003-8BE-5D4 + Start on
063-87E-91A Jungle, part 1
003-8BE-5D4 + Start on
073-87E-91A Jungle, part 2
003-8BE-5D4 + Start on
083-87E-91A Jungle, part 3
003-8BE-5D4 + Start on
093-87E-91A Labyrinth part 1
003-8BE-5D4 + Start on
0A3-87E-91A Labyrinth part 2
003-8BE-5D4 + Start on
0B3-87E-91A Labyrinth part 3
003-8BE-5D4 + Start on
0C3-87E-91A Scrap Brain, part 1
003-8BE-5D4 + Start on
0D3-87E-91A Scrap Brain, part 2
003-8BE-5D4 + Start on
0E3-87E-91A Scrap Brain, part 3
003-8BE-5D4 + Start on
0F3-87E-91A Sky Base, part 1
2A2-7CA-6E2 Don't lose breath underwater

Skipping to the Jungle and Labyrinth Zones, along with the breathing underwater, were tested with the real hardware and worked. I think the other codes to the other zones should work, too.

I'll post any other undocumented Game Genie codes I discover whenever I stumble on them.
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