This document provides guidance on developing a game concept, including defining key elements such as high concept, genre, target player, play value, competition, uniqueness, and game engine. It emphasizes that a high concept can succinctly communicate the core idea of a game. Game genres are classified based on gameplay rather than setting, with many examples provided across common categories like action, role-playing, simulation and strategy. Defining the target player involves considering their interests, demographics, and motivations for play. Competition refers to similar existing games, while uniqueness outlines how the concept differs.