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THIS IS STILL BEING FINISHED So, I came up with the timeline of the games with the help of this wikia and the website, as well as fan opinions. I decided to include GameGear  games as well in the main world.


Sonic the Hedgehog          1991               SEGA Genesis                                      

Sonic the Hedgehog          1991               SEGA GameGear      

Tails' Adventures               1995               SEGA GameGear

Sonic the Hedgehog CD    1993               SEGA CD

Sonic the Hedgehog 2       1992               SEGA GameGear

Sonic the Hedgehog Chaos/Sonic and Tails 1993 SEGA GameGear

SegaSonic the Hedgehog 1995                Arcade

Sonic the Hedgehog 2       1991               SEGA Genesis

Knuckles in Sonic 2            1992,1994     SEGA Genesis Lock-On                        Note: Not Part of Timeline, but Sonic 2

Sonic the Hedgehog 3: Sonic & Knuckles 1994 SEGA Genesis Lock-On

Sonic the Hedgehog Triple Trouble 1994  SEGA GameGear

Sonic the Hedgehog Blast  1996               SEGA GameGear

Sonic the Hedgehog 4: Episode 1 2010    Xbox 360, PS3, Wii, iOS

Sonic the Hedgehog 4: Episode Metal 2010,2012 Xbox 360, PS3, iOS

Sonic the Hedgehog 4: Episode 2 2012    Xbox 360, PS3, iOS

Knuckles Chaotix                1995              SEGA 32X

Sonic the Hedgehog 4: Episode 3  SCRAPPED                               

Sonic Adventure