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Sonicology - Guide to Sonic ROMs

This is a guide to the various Sonic-related ROMs which have been dumped (and some yet to be dumped). There are no ROMs available for download here. Copying the GoodXXX name of a ROM into Google will help you find places to download the ROMs. Don't email me asking for ROMs.
Megadrive/Genesis

--- GoodGen ROMs ---
Sonic the Hedgehog (W) (REV 00) [!] - The standard first release of Sonic 1.
Sonic the Hedgehog (W) (REV 01) [!] - Japanese-only version of Sonic 1, with bugfixes and enhancements.
Sonic the Hedgehog (W) [p1][!] - Pirate version of Sonic 1, with copyrights, logos and serial number removed.
Sonic the Hedgehog (W) [p2][!] - Pirate version of Sonic 1, with copyrights and logos removed.
Sonic the Hedgehog 2 (Beta) - Beta version of Sonic 2.
Sonic the Hedgehog 2 (W) [!] - Revision 01 of Sonic 2.
Sonic The Hedgehog 2 (W) (REV SC02) - Probable revision 02 of Sonic 2, extracted from Sonic Compilation.
Sonic the Hedgehog 3 (E) - European Sonic 3.
Sonic the Hedgehog 3 (J) [!] - Japanese Sonic 3.
Sonic the Hedgehog 3 (U) [!] - American Sonic 3.
Sonic and Knuckles (W) [!]
Sonic and Knuckles & Sonic 1 (W) [!] - S&K with Sonic 1 lock-on.
Sonic and Knuckles & Sonic 2 (W) [!] - S&K with Sonic 2 lock-on.
Sonic and Knuckles & Sonic 3 (W) [!] - S&K with Sonic 3 lock-on.
Sonic and Crackers (Beta) - Sonic Crackers, the beta test version of Chaotix.
Sonic 3D Blast (F) [!]
Sonic Compilation (E) [!] - Contains Sonic 1, Sonic 2 and Dr. Robotnik's Mean Bean Machine.
Sonic Compilation (W) [!]
Sonic Spinball (E) [!] - European Sonic Spinball.
Sonic Spinball (J) [!] - Japanese Sonic Spinball.
Sonic Spinball (U) (alt music) [!] - American Sonic Spinball, with music by Dreams Come True.
Sonic Spinball (U) [!] - American Sonic Spinball, without music by DCT.
Sonic Spinball (U) [p1] - Pirate version of Sonic Spinball.
Sonic Spinball (Beta) - Beta version of Sonic Spinball.
Sonic Jam 6 (Unl) - Pirate game, very similar to Super Mario Bros.
Knuckles Chaotix 32X (E) [!]
Knuckles Chaotix 32X (JU) [!]
Dr. Robotnik's Mean Bean Machine (Beta) - Beta version of Bean Machine.
Dr. Robotnik's Mean Bean Machine (J) [x] - Japanese Bean Machine, bad ROM dump.
Dr. Robotnik's Mean Bean Machine (U) [!] - American Bean Machine.
Sonic Eraser (J) [!] - SegaNet ROM, acquired by Sonic CulT.
--- Non-GoodGen ROMs ---
Sonic 1 (JAP2 revision) - Extracted from Sonic Mega Collection, has the double-death spike bug fixed.
Sonic 2 (Pirate version)
Sonic 3D Blast (Pirate version) - dumped by Eric Wright.
--- Undumped games ---
Sonic 2 (Revision 00) - First release of Sonic 2.
Sonic 2 (Genuine revision 02) - Third release of Sonic 2.
Sonic 3 (Pirate version) - The cart is owned by me. I'll dump it as soon as I get the necessary equipment.
Sonic and Knuckles (Pirate version) - Also owned by me.
Sonic 3 (Prototype) - Cart owned by LocalH, probably just the final version on an EPROM cart.
Sonic 3D (Prototype) - Spotted on eBay in Feb 2005.
Dr. Robotnik's Mean Bean Machine (European) - I'm not sure if this actually exists. The (U) ROM may have been used in Europe.
Dr. Robotnik's Mean Bean Machine (Japanese) - Probably a pirate. This game hasn't been correctly dumped yet.
Master System / Mark III
--- GoodSMS ROMs ---
Sonic the Hedgehog (UE) [!]
Sonic the Hedgehog 2 (UE) (V1.0) [!]
Sonic the Hedgehog 2 (UE) (V2.2)
Sonic Chaos (UE) [!]
Sonic Spinball (UE) [!]
Sonic Blast (Brazil) [!] - Ported from the Game Gear version by TecToy.
Dr. Robotnik's Mean Bean Machine (UE) [!]
Game Gear
--- GoodGG ROMs ---
Sonic the Hedgehog (JUE) (Proto) [!] - Beta version of Sonic 1, ported from the Master System version.
Sonic the Hedgehog (JUE) (V1.0)
Sonic the Hedgehog (JUE) (V1.1) [!]
Sonic the Hedgehog 2 (JUE) [!]
Sonic Chaos (JUE) [!]
Sonic & Tails (J) [!] - Japanese version of Sonic Chaos.
Sonic the Hedgehog - Triple Trouble (UE)
Sonic & Tails 2 (J) - Japanese version of Triple Trouble.
Sonic Spinball (UE)
Sonic Blast (U)
Sonic Drift (J)
Sonic Drift 2 (J) [!]
Sonic Labyrinth (JUE)
Tails' Adventures (UE)
Tails' Sky Patrol (J) [!]
Dr. Robotnik's Mean Bean Machine (UE) [!]
Game Boy Advance
--- GoodGBA ROMs ---
Sonic Advance (J) [!]
Sonic Advance (E) (M5)
Sonic Advance (U) [!]
Sonic Advance 2 (E) (M6)
Sonic Advance 2 (U) (M6) [!]
Sonic Advance 2 (J)
Sonic Pinball Party (E) (M6)
Sonic Pinball Party (J) (M6) [a1]
Sonic Pinball Party (U) (M6)
Sonic Battle (J) (M2)
Tiny Chao Garden (U) (MB)
Tiny Chao Garden (U) (MB2GBA)
SonyC Demo (PD) - Unofficial game.
--- Non-GoodGBA ROMs ---
Sonic Advance 3 (all versions)
Sonic Battle (Euro and US versions)
Sonic X Videos
--- Undumped games ---
None
Arcade
--- Emulated ROMs ---
Sonic the Hedgehog MegaPlay - Sonic 1 with a backwards-running timer and high score screen. Listed in GoodGen as "Sonic the Hedgehog (MP)". Emulated by MAME.
SegaSonic the Hedgehog (REV A) - Prototype version of the 3D platform game, with several levels missing. Emulated by MAME and Modeler.
SegaSonic the Hedgehog (REV C) - Final version. Emulated by MAME and Modeler.
Sonic Championship - Fighting game by AM2. Emulated by Nebula M2.
--- Undumped games ---
SegaSonic the Hedgehog (REV B) - Second version.
Other Non-Sega
--- GoodSNES ROMs ---
Sonic the Hedgehog (Unl) [p1] - Pirate game.
--- GoodNES ROMs ---
Somari - Weird pirate game featuring Mario in levels from Sonic 1.
Sonic 3D Blast 5 [!] - Same as Somari, except you play as Sonic.
Sonic 3D Blast 6 - Updated version of Sonic 3D Blast 5, with new title sceen and stuff.
--- GoodGBx ROMs ---
Sonic 3D Blast 5 (Unl)
Sonic 6 (Unl)
Sonic 7 (Unl) [C]
Sonic the Hedgehog Demo (PD) [C]
--- GoodNGPx ROMs ---
Sonic the Hedgehog - Pocket Adventure (JUE) [!]
--- GoodPCE ROMs ---
Sonic 1 Green Hill Sound Demo by Trilinear (PD)
--- Palm Handheld games ---
Sonic 1 - Port of the Game Gear version.
Dr. Robotnik's Mean Bean Machine - Port of the Game Gear version.
--- N-Gage games ---
Sonic N - Port of Sonic Advance.
Sonic N (Beta)