Documentation guide

A living GDD for clearer game design

A useful GDD does not try to define everything on day one. It organizes the idea, clarifies rules, and leaves a living foundation that can grow with the design.

Create my GDD in Mainloop

What a GDD is for

A Game Design Document is a working foundation for thinking through and communicating a game design. It organizes vision, rules, mechanics, systems, levels, narrative, and production without turning the design into a rigid file.

Useful GDD structure

  • High concept and main fantasy
  • Player goal and design pillars
  • Primary and secondary loops
  • Mechanics, rules, limits, and feedback
  • Systems, dependencies, and progression
  • Characters, story, or context when they affect design
  • Areas, levels, blockouts, and puzzles
  • Risks, open decisions, and next steps

Practical use

How to create it without overdocumenting

You can use this structure inside or outside Mainloop. In Mainloop, each part lives as an editable, connected module instead of one long document.

  1. 01

    Start with a playable idea

    Explain what experience you want to create, what the player does, and why that fantasy can sustain a game.

  2. 02

    Define the foundation before the details

    High concept, pillars, and player goal keep you from filling pages before the design has direction.

  3. 03

    Turn ideas into rules

    Each important mechanic should explain action, limit, cost, reward, and expected feedback.

  4. 04

    Connect systems and levels

    Review how progression, resources, economy, combat, abilities, or levels affect each other.

  5. 05

    Keep open decisions visible

    A useful GDD also shows what still needs decisions so you can iterate without losing context.

Criteria for reviewing the GDD

  • A new person can understand what game is being designed
  • Main mechanics have clear rules and limits
  • Systems do not contradict the intended experience
  • Levels respond to design intent
  • Open decisions are visible
  • The document can be updated without rewriting everything

Frequently asked questions

Does a GDD need every module from the start?

No. Start with the design foundation and add modules when that part of the game needs more clarity.

Does Mainloop help if the idea is still rough?

Yes. It can help turn a loose idea into an editable structure with open decisions visible.

Does AI write the final GDD for me?

No. AI can propose structure and detect gaps, but creative and design judgment remains yours.

Turn your GDD into a working foundation

Use Mainloop to organize modules, review decisions, and keep documentation useful as the game changes.

Create my GDD in Mainloop