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Extremely common in the golden age of arcades but became much less frequent as companies used modified existing hardware instead to save on R&D costs and easier cross-platform development, or tried to differentiate between the home and arcade experience with control scheme gimmicks instead. Hardware made specifically for the arcade to provide for graphics and performance unseen on home consoles. Three main types of arcade machines can be distinguished: Sometimes, similar menus meant for developers (labeled debug or test usually, sometimes requiring a developer BIOS like with some Neo Geo games) are left in the game too. Some games have a service mode (mapped to F2 in MAME) with menus meant for the arcade owner to set dipswitches for difficulty, censorship, language, and most importantly a "Free Play" mode that allows players to continue as many as they want without requesting more coins. Games were designed to eat as many quarters as possible, which is emulated with the "Coin" key. Machines often varied by their design and, unlike consoles, were often tailored to just one game.