Sonic 1 Swift is a fan-made ROM hack of the original Sonic the Hedgehog for the Sega Genesis likely focused on increasing the game's speed and overall pace. The original Sonic the Hedgehog, released by Sega in 1991, set a standard for high-speed platforming. 'Swift' suggests modifications to character movement, level design, or other factors to enhance the feeling of speed. The developers are independent of Sega.

Sonic 1 Swift

Sonic 1 SCP 001 (When Day Breaks) Edition