Sonic The Hedgehog: Special Version

 (sometimes called Sonic 1: Special Version) is a ROM-Hack of Sonic The Hedgehog for the Sega Genesis. The game is a heavily edited version of the original game.

Gameplay
The game plays just like Sonic The Hedgehog but with the ability to spindash (which functions just like Sonic The Hedgehog 2 & 3) and air dash/homing attack on enemies by pressing the jump button in the air whilst spinning.

Music
The game uses Sega Genesis/Mega Drive music or Genesis/MD renditions of other music.

List is incomplete on this page at the moment.
 * "Title Screen" - Battle Victory, Sailor Moon Another Story
 * "Green Hill Zone Act 1" - Slash Hill Zone Act 1, Sonic the Headghog 4: Episode 1
 * "Green Hill Zone Act 2" - Slash Hill Zone Act 2, Sonic the Headghog 4: Episode 1
 * "Green Hill Zone Act 3" - Door Into Summer, Knuckles Chaotix
 * "Marble Zone Act 1" - Break Silence, Ristar
 * "Marble Zone Act 2" - Misty Rain, Mega Man ZX
 * "Marble Zone Act 3" - Sigma Fortress 1, Mega Man X
 * "Spring Yard Zone Act 1" - Potato Peeler Zone by Ivan Yo
 * "Spring Yard Zone Act 2" - Unkown, Crayon Shin Chan
 * "Spring Yard Zone Act 3" - Midnight Greenhouse, Knuckles Chaotix
 * "Labyrinth Zone Act 1 - 3" - Song of Storms, The Legend of Zelda: Ocarina of Time
 * "Star Light Zone Act 1" - Clash on the Big Bridge, Final Fantasy V
 * "Star Light Zone Act 2" - Title Screen, Time Trax
 * "Star Light Zone Act 3" - Drivin' Through on Max, F-Zero X
 * "Scrap Brain Zone Act 1" - Scrambled Egg Zone, Sonic the Hedgehog 2 (Master System/Game Gear)
 * "Scrap Brain Zone Act 2" - Scene 1, Teenage Mutant Ninja Turtles 2 - The Arcade Game
 * "Scrap Brain Zone Act 3" - Industrial District, Columns III

Collision Clipping
Due to the incredible speed the player can achieve from air dashing, it's possible to clip into walls. Sometimes it's getting pushed in by a spike or mashing the jump button in at parts of walls.