The ones I have noted are:
- GHZ: Green Hill (from Sonic 1)
- CPZ: Chemical Plant (from Sonic 2)
- SPZ: Studiopolis
- FBZ: Flying Battery (from Sonic 3&K)
- PGZ: Press Garden
- SSZ: Stardust Speedway
- HCZ: Hydrocity (from Sonic 3&K)
- MSZ: Mirage Saloon
- LRZ: Lava Reef (from Sonic 3&K)
- MMZ: Metalic Madness
- OOZ: Oil Ocean (from Sonic 2)
- TMZ: Titanic Monarch
I haven't been able to progress farther. Are there hidden zones? What am I missing?
Best Answer
Sonic Mania has 13 different zones. (8 remastered, 5 new).
Egg Reverie Zone is the thirteenth and true final Zone in Sonic Mania. It can only be accessed while playing as Sonic after collecting all 7 Chaos Emeralds.
You can view all of the available zones through the unlockable level select menu in Debug Mode.
Source: Sonic News Network - Sonic Mania Zones