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Game Boy Color exclusive games are housed in clear-colored Game Pak cartridges. They are shaped differently than original Game Boy Game Paks. Notably, these cartridges lack a notch that prevented the original Game Paks from being removed while the original Game Boy was powered on due to a plastic piece attached to the power switch, which would slide over the notch, locking a cartridge inside the system during gameplay (although some special cartridges like "Kirby Tilt 'n' Tumble" do include this notch). The lack of this notch keeps original Game Boy systems loaded with Game Boy Color cartridges from powering on. Similarly, Game Boy Pocket, Super Game Boy, Super Game Boy 2, and Game Boy Light will power on when loaded with a Game Boy Color cartridge, but will refuse to load the game and will display a warning message stating that a Game Boy Color system is required. This same warning message can be viewed on an original Game Boy as well if the piece that slides into the notch is cut out of the Game Boy. Some Game Boy cartridges such as "Chee-Chai Alien" and "Pocket Music" cannot be played on Game Boy Advance and Game Boy Advance SP systems. When inserted and powered on, these systems will exhibit a similar error message and will not load the game.