Chemical Plant Zone is the second Zone of Sonic Mania, which is based on Chemical Plant Zone from Sonic the Hedgehog 2. The player is sent here by the power of the Phantom Ruby at the hands of Dr. Eggman.
Set in Dr. Eggman's chemical plant, this Zone is a token industrial cityscape with a network of blue chemical pipes that again serve as the Zone's many twisting pathways. Act 1 is very similar to the original Zone and incorporates level design from both Acts of the original, with winding passageways, pipes, harmful chemical globs, and, of course, Mega Mack. The infamous "rising pool" is also featured in this Act, with the Mega Mack now rising much faster than before. New additions include an entirely new bottom route and Metallic Madness-style pipes where the player can choose their own path. Compared to the original Zone, the sky is now populated with clouds.
Act 2 has Sonic and the gang exploring deeper into the plant to an indoor section, with large beakers and jars present in the background. The blue chemical that composes the ball snakes from Act 1 now appear in large pools that are harmful unless the player has a Bubble Shield. By standing on giant syringes, this hazardous fluid can be transformed into a gelatinous substance that can be bounced on, propelling the player high into the air. Along the way the player will find large DNA strands that carry them through the air, encased in a bubble of Mega Mack. Sticky platforms that slide across walls and ceilings can be clinged to and jumped off of to move to different areas of the Act. Structurally, Act 2 is a vertically-oriented Act that starts at the bottom and has the player continually progress upwards.
After defeating the boss of the Zone, the player takes a transport tube that leads to Studiopolis Zone.
In Encore Mode, Chemical Plant Zone has a palette change, with the red skies and structures changing to a cooler dark blue.
References and Easter eggs