Sonic Speedrun is a fan-made game, likely designed around the core concept of fast-paced gameplay, true to the speedrunning aspects of the Sonic series.  It’s unclear if this is a ROM hack of an existing game or a completely original title.  The gameplay likely revolves around maximizing speed and completing levels as quickly as possible, with features tailored for a speedrunning experience. Created outside of Sega, it showcases the dedication of Sonic fans to create custom content.

Sonic Speedrun

Sonic Revelation