In a computer game, all numerical values are stored "as is" in memory. Gamers could reprogram a small part of the game before launching it. In the context of games for many 8-bit computers, it was a usual practice to load games into memory and, before launching them, modify specific memory addresses in order to cheat, getting an unlimited number of lives, currency, immunity, invisibility, etc. Such modifications were performed through POKE statements. The Commodore 64, Amstrad CPC range and ZX Spectrum also allowed players with the proper cartridges or Multiface add-on to freeze the running program, enter POKEs, and resume. Some games tried to detect the Multiface and refused to load if it was present. The earliest models had no ability to "hide". Later revisions either included a switch, hid if the menu had been opened and closed before loading the game, or automatically hid.