Counter-Strike itself is a mod, and it has developed its own community of script writers and mod creators. Some mods add bots,
while others remove features of the game, and others create different
modes of play. Some mods, often called "admin plugins", give server
administrators more flexible and efficient control over their servers.
There are some mods which affect gameplay heavily, such as Gun Game,
where players start with a basic pistol and must score kills to receive
better weapons, and Zombie Mod, where one team consists of zombies and
must "spread the infection" by killing the other team (using only the
knife). There are also the Superhero and mods which mix the first-person
gameplay of
Counter-Strike with an experience system, allowing a
player to become more powerful as they continue to play. The game is
also highly customizable on the player's end, allowing the user to
install or even create their own custom skins, HUDs, spray graphics,
sprites, and sound effects, given the proper tools.