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Master Console
Mainframe computer systems have a special terminal where the system operator can issue privileged commands to the system, to do things mere mortals can't do, like tell the system you've mounted a tape, or to authorize special privileges. When this is a single, permanent terminal, it's often called the Master Console.

Many video games have a master console as well. In this case, the master console is enabled either by a command-line option or a special key, such as the tilde "~" on US keyboards or "`" on European keyboards (They're in the same position). When the master console is enabled, one can change many of the features of the game, including changing internal variables (such as the weight of gravity), enable special God Mode features, give infinite ammo, or virtually anything the programmers choose to put in the master console subsystem.

Note the term "master console" is being used here to keep from confusing with game consoles, the dedicated hardware used to play games. Should not be confused especially with the Master System console.

Games that have a master console include:

Interactive Fiction
  • The Dungeon game for the PDP-11 minicomputer (later modified and released for home microcomputers as the Zork trilogy) had a debugger that could be used to change things, variables and constructs in the game.
  • Colossal Cave Adventure had a "MAGIC MODE" command that allowed the game manager, when the game was running on a shared computer such as a mainframe, to restrict times that the game could be played, set the welcome message, and optionally change the password to access magic mode. The bytecode to do this is still present in some PC versions — it's just the "Is this a shared computer?" system call that's Dummied Out.

Pinball Games
  • The pinball game Balls of Steel has a master console where you can enter cheats. However, if you use the console too many times without entering a valid cheat, the console will be disabled until you reset the game.

First-Person Shooter
  • Quake might have been the first FPS to use a drop-down command-line console. The game's configuration files were actually shell scripts for the console, run through during startup just like your autoexec.bat or .bashrc.
  • Half-Life, originally based on the Quake engine, continued to include a console on the Source engine games (Half-Life 2 onwards) which allows you to enable or disable certain features. Portal adds additional features to change some of the functionality of the portal gun. And as Half-Life before, other games produced on Source carry on the convention.
  • The Unreal series' console added an entry-line pop-up version that did not obscure the screen. Unreal engine games frequently implement chat commands by popping up a command line pre-loaded with a "say" command. In later engines, the drop-down hotkey has migrated to F10.
  • Battlezone has probably one of the most powerful consoles out there, capable of doing stuff like "swapping the skybox". In fact, basic console knowledge is required for mappers since the second game's built-in map editor is not exactly user-friendly.
  • Several source ports of Doom such as ZDoom, add a console.

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