Chemical plant is still a mess in Mania as it was in Sonic 2. This is even worse with the path swappers that make an obvious backtrack much harder than it looks. https://www.youtube.com/watch?v=AE4ZkS14aqs
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11-22-17
That improvised boss speedkill saved the time needed to take those extra 20 Rings. https://www.youtube.com/watch?v=_QxphID8m9c