Flame Mobile

From Sonic Retro

Quite a step up from the easy mid-boss, Angel Island Zone's boss, Flame Mobile (フレイムモービル), involves hitting Robotnik's eggpod eight times, while avoiding the two (or four, if playing as Knuckles) fireballs shot from it. At both ends of the arena are bottomless pits, and Robotnik will disappear behind the waterfall every now and again so you'll have to time your jumps. After your points tally go right, you meet the malicious Knuckles again—he laughs and hits a switch which makes the bridge you're on collapse, and you fall into Hydrocity Zone.

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Levels in Sonic the Hedgehog 3
Angel Island Zone | Hydrocity Zone | Marble Garden Zone | Carnival Night Zone | IceCap Zone | Launch Base Zone | Special Stage
Levels in Sonic & Knuckles
Mushroom Hill Zone | Flying Battery Zone | Sandopolis Zone | Lava Reef Zone | Hidden Palace Zone | Sky Sanctuary Zone | Death Egg Zone | Doomsday Zone | Special Stage
Two-Player Levels in Sonic the Hedgehog 3
Azure Lake Zone | Balloon Park Zone | Chrome Gadget Zone | Desert Palace Zone | Endless Mine Zone