Graviton Mobile

From Sonic Retro

When you get to the boss area at the end of Carnival Night Zone Act 2, you will see Robotnik fly in with the Graviton Mobile (グラビトンモービル), a big expansion to his eggpod. He drops the green ball down at you then flies over above it and uses the power of electromagnetism around the ball. While he does this, you will be pulled towards the electricity, so keep away from him while he does this! After he finishes using the electricity, he flies down to pick the ball up. When he does this, start hitting him on the head to get a hit. Do this eight times to defeat him and finish the zone. Knuckles, however, being the lucky arse he is, doesn't have a boss in this zone!

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