Final answer:
The term for organizing ideas into a clear plan before building a game is the Game Design Document (GDD).
Step-by-step explanation:
The term that refers to a place where all of your ideas can be organized into a clear plan prior to starting to build your game is a) Game Design Document (GDD). The GDD is an essential tool used in game development that captures all aspects of the game's design, including the game mechanics, story, characters, user interface, and more. It serves as a blueprint for the development team to follow and ensures that everyone is on the same page regarding the game's vision and objectives.