On the title screen, if you press the Run button at the exact moment when Momo changes from her civilian form to her powered-up form, a hidden options menu will appear that functions as both a sound test and a level select. The top half of this screen depicts Momo lounging in a bathtub, with a caption below reading "MOMO IZIRI". The latter is a play on words referencing the screen's contents, as it can be translated as either "tinkering with Momo" (i.e. playing around with in-game settings) or "groping Momo."