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Sonic.EXE is a Horror version of the first Sonic The Hedgehog! Happy Nightmares! >:D

Sonic.exe: The disaster remake, The Disasterpedia

Sonic.EXE: The Game Windows - ModDB

Download Sonic.EXE - MajorGeeks

Sonic.EXE 2 [Sally.EXE] Windows game - ModDB

Sonic.exe (Nightmare Beginning version) [Boll Deluxe] [Mods]

Download Sonic Heroes (Windows) - My Abandonware

Vs Sonic.EXE 2.5 / 3.0 INCOMPLETE OFFICIAL RELEASE [Friday Night Funkin'] [ Mods]

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DOOM 87: The Lost World (Beta Release) for DOOM II - Vanilla-compatible maps. - WAD Releases & Development - Doomworld