A change in gameplay can be used to create a "de facto" minigame, such as the "Green Demon Challenge" in "Super Mario 64", where the object is to avoid collecting a 1-up which chases the player, even passing through terrain, while the player attempts to collect all red coins on a level. Other challenges have been built around reaching normally unreachable areas or items, sometimes using glitches or gameplaying tools, or by completing a level without using an important game control, such as the 'jump' button or joystick.