engine is written using the C language and was originally built with the Allegro library, later replaced by SDL libraries. Made using the Automatic Stage Creation Tool, the stage lacks any animating elements and doesn't allow the camera to cover much vertical distance, though it just about scrolls up enough to keep the greater portion of character using a Super Jump on screen.The M.U.G.E.N. GroxDJ's version of Chemical Plant Zone uses sprites that are mainly ripped from the first three Sonic games, with the majority of the assets having been taken from Sonic the Hedgehog 2, though the background has elements from the original Sonic the Hedgehog (Scrap Brain Zone and Star Light Zone) and the capsule in the stage's centre originates from Sonic the Hedgehog 3, leaving the stage's floor as the only element which wasn't taken from any of the aforementioned games, instead being a modification of the floor from Original Zero's stage in The King of Fighters 2002: Unlimited Match all of the sprites ripped from one of the aforementioned games have subsequently been sharpened during the stage's creation process, ironically resulting in them having noticeable blurring, particularly those closer to the foreground. The stage is notable for its incredible width, which makes getting from one side of the stage to the other quite a long and arduous trek for all but the fastest combatants or those without an otherwise high-speed method of travel on the other hand, the stage's camera doesn't have quite as much work to do when scrolling vertically as is does when scrolling horizontally, though there's still plenty of head room for characters with Super Jumps to use them without needing to worry about going offscreen. Eggman mostly follows the camera's horizontal movements in his Water Eggman, but briefly disappears below the stage floor when the Water Eggman's tank of Mega Mack empties its contents onto his head, only to re-emerge some time later with a refilled tank and Dr. Sonic and Tails make respective background appearances running eastwards atop the raised platform and being transported westwards via a high-speed warp tube, while Dr. MabsKMK's Chemical Plant Zone uses sprites taken from Sonic the Hedgehog 2, though the ChemicalPlant2 and ChemicalPlant4 definition files recolour the background buildings to match their appearance in the Sonic - The Lost Land 2 ROM hack, while also adding a fog effect that partially obscures the lower parts of certain background objects.

'Chemical Plant Zone' from Sonic the Hedgehog 2

Mugen sonic stage