So, the Cave is probably the area with the least updates (the Temple is a close second but it's required for Human Stickie, who came in a fairly recent update). The part which got the most updates is the Laboratory, although that is technically a different area, and the cave itself hasn't been update since Party Stickie. So, I am making a contest. Basically go to this link https://scratch.mit.edu/projects/1258872607 and make a Stickie for the cave. The best would be added in the next update, and the rest will be delayed to future updates
