Cheese Roll 2.1 is out now!
In Cheese Jump, if you type "R", "E", "V", "E", "R", "S", "E", you will go into reverse mode [P1]. While in reverse mode, all of the colors change to their reverse colors, and the controls are swapped. (A = Right, D = Left, etc)
History: Reverse mode was added in Beta 1.1.3 by Seth and hasn't changed since.
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What reverse mode looks like. (P1)