Basic Roleplaying: The Chaosium Roleplaying System

This book comprises a roleplaying game system, a framework of rules aimed at allowing players to enact a sort of improvisational radio theateronly without microphonesand with dice determining whe ther the characters succeed or fail at what they attempt to do. In roleplaying games, one player takes on the role of the gamemaster (GM), while the other player(s) assume the roles of player characters (PCs) in the game. The gamemaster also acts out the roles of characters who aren't being guided by players: these are called non-player characters (NPCs).