Stomach acid

Stomach acid is an element found in each level of Slime-san. Contact with stomach acid will destroy Slime-san or any other Playstyle character controlled in the level. After a certain amount of time passes in a room, sometimes immediately but usually a few seconds, stomach acid starts to creep in to a room. The side which stomach acid creeps in varies for each room of each level.

In Sheeple's Sequel and Superslime levels a mechanical red and green wall will appear instead of stomach acid, despite the HUD sign still showing the stomach acid. This wall will also destroy Shadow, suggested by the red and green coloring.