The Sonic games for the Sega Master System and the Game Gear are much less well known than their Genesis/Mega Drive counterparts and have a reputation for being quite challenging, especially in handheld form. You'd never know this from the speed Sonic blazes through the game here.
Unlike later 8-bit Sonic games, there are significant differences in levels between the SMS version and the Game Gear version; here the latter is used primarily for faster boss fights.
If you like this run, also check out the run for SMS Sonic 2.
FLASHING LIGHTS WARNING: This movie features rapidly flashing lights from 16:58 to 17:26 and from 19:14 to 19:25, which may cause epileptic seizures for those affected.