Powered by the Apocalypse in the context of "Gamemaster"

A gamemaster (GM; also known as game master, game manager, game moderator, referee, storyteller, or master of ceremonies) is a person who acts as a facilitator, organizer, officiant regarding rules, arbitrator, and moderator for a multiplayer role-playing game. The act performed by a gamemaster is sometimes referred to as "gamemastering" or simply "GM-ing."

The role of a GM in a traditional tabletop role-playing game (TTRPG) is to weave together the other participants' player-characters' (PCs) stories, control the non-player characters (NPCs), describe or create environments in which the PCs can interact, and solve any player disputes. This basic role is the same in almost all traditional TTRPGs, with minor differences specific to differing rule sets. However, in some indie role-playing games, the GM role significantly differs from the traditional pattern. For example, in Powered by the Apocalypse systems, the other players assist the GM in creating both the NPCs and the details of the campaign setting.

An indie role-playing game is a role-playing game published by individuals or small press publishers, in contrast to games published by large corporations. Indie tabletop role-playing game designers participate in various game distribution networks, development communities, and gaming conventions, both in person and online. Indie game designer committees grant annual awards for excellence.

In the early 2000s, indie role-playing discussion forums such as The Forge developed innovative design patterns and theories. In 2010, the game Apocalypse World established the popular design framework Powered by the Apocalypse, inspiring hundreds of similar games. Starting in the early 2010s, indie game publishing provided new opportunities for LGBTQ writers to share underrepresented stories.