If Metropolis Zone was in Sonic Mania, it would go something like this (where Act 1 is just the original level remade, and Act 2 is completely reimagined and has more fast level design)
made in Classic Sonic Simulator v13
0:00 Metropolis Act 1
3:45 Metropolis Act 1 BOSS
4:27 Metropolis Act 2
9:06 Metropolis Act 2 BOSS