Chemical Plant (Sonic Generations)

Chemical Plant is a stage in the game Sonic Generations in the Genesis Era of the game, representing Sonic the Hedgehog 2. It is based off of the original zone from Sonic the Hedgehog 2. It is also home to Metal Sonic (Classic), who can be found in the hub. Talking to him engages in the first Rival Battle.

Act 1
Classic Sonic starts out next to two roads leading a quarter of the level then leading into a new place a mechanical room with machine claws controlling the place leading to the original Mega Mack rising. When escaping, the player will run through a loop, thereby causing him to hit the goal plate.

Act 2
Modern Sonic starts (as usual) running through combo tricks and special ramps directing him to the 2 roads. Both the high and low lead Sonic to a large tube, sending him down with the blue chemicals. After he falls, Sonic runs into a room where the Mega Mack is beginning to rise (just like in Act 1), but deeper and slightly quicker. This time when escaping the area, the Chemical Plant is self-destructing. He then proceeds to race to the Goal Ring to escape the destruction behind him.

Act 1

 * Tails: Toxic Skies: Press Triangle/Y to grab Tails' hands to fly and reach the goal within the time limit.
 * Which Switch is Which?: Flip the various Switches and make your way to the goal within the time limit.
 * Aqua Shield Challenge: Use Aqua Shield to reach the goal in time and obtain the Aqua Shield Skill!
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the goal.
 * Invincibility Challenge: Get the Invincible power-up to get past hordes of enemies and reach the goal in time.

Act 2

 * One Ring Challenge: Reach the goal in time with only one Ring!
 * Doppelganger Race!: Face off against Sonic's double and beat him in a race to the goal.
 * Amy: Taking the Leap Together!: Press Triangle/Y to call Amy for a super-high jump to get to the goal in time.
 * Grappling with Grabbers: Avoid the Grabbers' immobilizing grasp and get to the goal in time.
 * Underwater Ring Machine: Collect a set number of Rings scattered by the Sprinkler enemy and reach the goal in time.

Enemies

 * Spiny
 * Grabber

Trivia

 * Act 2 looks similar to the day stages of Eggmanland from Sonic Unleashed.
 * In Act 1 of the Classic version, the level's theme sounds very similar to the original Chemical Plant Zone music, except the drums are different. The Modern version of the theme is a lower-pitched rock remix.
 * As seen in the video, the Mega Mack in Act 2 is deeper than in Act 1, but like in the original Chemical Plant Zone, the Mega Mack in Act 1 is constantly rising.
 * In Act 2 of this stage, the Chemical Plant seems to be self-destructing.
 * This may be a homage to Act 2 of Terminal Velocity from Sonic Colors, where Terminal Velocity was being destroyed.
 * Even though the pink Mega Mack is considered deadly like most of the liquids, Amy finds it pretty.
 * This is the only stage in the Classic era that doesn't have a "Fast" remix.
 * In Act 2, Super Sonic cannot push the yellow blocks with Boost. As a result, it is possible for him to get stuck in submerged places until he runs out of rings.
 * The Modern stage contains a water slide that is reminiscent of Lost World from Sonic Adventure and Cannon's Core from Sonic Adventure 2. This is most likely a coincidence, however.
 * Like Chemical Plant Zone, Cannon's Core also contains differently-colored water.
 * This zone contains fewer badniks than any other zone in Generations.
 * Act 2's background music can be considered by some as the most different of all of the Modern remixes to the originals.