This phrase refers to the user-created scenarios playable within the Zombies game mode of Call of Duty: World at War. These modifications, developed by players using dedicated tools, introduce new environments, challenges, weapons, and gameplay mechanics beyond the content included in the original game. An example includes maps recreating locations from other media or featuring unique boss battles.
The ability to create and distribute this content significantly extended the lifespan and popularity of Call of Duty: World at War. It fostered a vibrant community of modders and players, offering virtually limitless replayability and customization options. The availability of these modifications empowered players to experiment with unique gameplay experiences and fostered a culture of creativity and collaboration.