Cheese Jump Upside Down is an unreleased version of Cheese Jump, developed by Jack Clare and Sachi Iang.
Jack Clare began developing Upside Down after downloading the original game, with collaborations from Sachi Iang, as modifying the code proved more complicated for this Upside Down than other versions.
Upside Down Mode is played with the same goal: to get as high as possible through a series of jumps. Upside Down Mode is different in that gravity is reversed, and instead of jumping from the top of platforms, the truckle jumps down from the bottom. According to Jack Clare, avoiding death at the bottom of the screen has proved more difficult than it sounds.