Welcome to Sonic 3 & Knuckles Gameplay on Legendary mode. This is the first part. Sonic 3 gets extremely difficult without the powerups, rings and checkpoints and you constantly need to slow down and watch your speed in case you don't collide with any hazards throughout the zone. It is a h*ll of an experience.
Looks like Eggman isn't f***ing around this time.
NOTE: This is a Sonic 3 mod which removes all rings (except 2-3 rings on Launch Base which appears due to a glitch and in Flying Battery stored in capsules.) and all monitors are replaced with Eggman's. Even checkpoints are gone. Eggman appears to be much scarier and STARVED. Even the animals are gone and you won't find anything after destroying a badnik or smashing a capsule. What did Eggman do with the animals then?