When the mode is active, the cat’s "happiness meter" is removed. In standard play, missing a shot might lower the cat's mood, eventually ending the game. In Mischievous Mode, the cat is depicted as being in a state of manic energy. Consequently:
Some versions add a “catnip meter” that fills as you collect yarn balls; full meter allows manual activation of Mischievous Mode.
Operation "Frenzy": An Analysis of the "Mischievous Mode" Mechanic in Laser Cat