Powered by the Apocalypse
Powered by the Apocalypse (PbtA) is a game design framework developed by Meguey Baker and Vincent Baker for the 2010 game Apocalypse World.
Powered by the Apocalypse games are centered on resolving what characters do as Moves. Characters have access to a default selection of moves based on the expectations of the game setting. Most PbtA games are class-based. Character classes have access to a number of class-specific moves.
Moves are resolved by rolling two six-sided dice and adding the relevant modifier, should modifiers be a mechanic in the game. Success levels fall on a scale of total success, partial success, or failure—referred to as a "miss" in the system.