Chemical Plant Zone

Chemical Plant Zone
Second level, Sonic the Hedgehog 2
Number of Acts: 2
Boss: Water Eggman
Maximum rings, Act 1: 195 + 130
Maximum rings, Act 2: 157 + 140
Underwater areas: Act 2

The second zone in Sonic 2, Chemical Plant Zone is Dr. Robotnik's chemical plant, full of tubes and floating platforms. He uses a new substance called "Mega-mack" to try to kill Sonic.

Instruction Manual Description

“	Flash through a high-tech maze built with pipes and ducts. Robotnik's flooded the factory with a pool of toxic liquid called "Mega Mack" that poisons Sonic in a few moments!	„
— Sonic 2 US Manual, p. 12

Sonic Team Commentary (from Sonic Jam Strategy Guide)

“	At first this stage was set to appear about after Zone 10. Although there would be fewer Acts this time, we thought having about 18 zones would be good, but having each zone stand out and fit in the story in a way that was easy to follow, in the end it dropped down to 11 zones, and Chemical Plant was placed as the second stage. In the end it was a success (laughs).	„
— Yuji Naka

Enemies

• Grabber - Spider enemy, hangs from the ceiling and grabs Sonic. Then unless Tails can destroy the Grabber, it explodes and hurts/kills Sonic.
• Lander - Anemone enemy, moves very slowly and spits out missiles.

Other facts

An alternate level name for this is "Genocide City".

Technical Information

Offset	Description
0D	CPZ Level Value
$2E02	CPZ Palette
$2E62	CPZ Underwater Palette
$D27C	CPZ layer deformation info
$401B2	CPZ animated pattern load cue (0)
$40762	CPZ misc sprite mappings
$42376	CPZ object debug list
$453C0	CPZ and DEZ primary 16x16 collision index
$454E0	CPZ and DEZ secondary 16x16 collision index
$48774	CPZ act 1 level layout
$48A84	CPZ act 2 level layout
$4FAFE	Animated background section in CPZ and DEZ
$B5234	CPZ/DEZ 16x16 block mappings
$B6174	CPZ/DEZ main level patterns
$B90F4	CPZ/DEZ 128x128 block mappings
$E5E2C	CPZ act 1 ring locations
$E5F9E	CPZ act 2 ring locations