Sonic the Hedgehog: Time Attacked

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Sonic The Hedgehog: Time Attacked is a 2003 fan game made by Jamie Bailey. Time Attacked has been compared to commercial games released by Sega because of the game's detailed original graphics and the author's vast knowledge of Clickteam based programming.

Dr. Eggman has invented a time machine and uses it to go back in time to defeat Sonic following a failed attempt. Eggman succeeds and begins to create a paradox, causing the present-time Sonic to fade. Once he realizes what's going on with him, he sets off to stop Eggman before he completes the paradox and changes made in time are permanent.

Source: IGDB