Mainloop · AI GDD Tool

Design games with a living GDD and AI support

Mainloop helps game teams turn ideas into a living GDD with AI support, keeping game design decisions clear, connected, and ready to evolve.

Mainloop is a tool for game designers, level designers, and developers to create and maintain a living game design document. Use AI as support to structure ideas, work in modules, connect mechanics, systems, and levels, and move forward without turning design into dead documentation.

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For game designers · AI-assisted GDD · Living game documentation

How do you work on design?

Structure decisions, mechanics, and game systems inside a living game design document.

Modules to document each part of the design

A useful GDD separates design into clear parts while keeping the connections between them visible. Mainloop organizes those parts into modules so you can work on vision, mechanics, systems, levels, puzzles, blockouts, and production without losing context.

Choose a part of the GDD to see what to organize.

Define high concept, vision, tone, genre, design pillars, and player goal.

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Validate the full GDD

Essentials

A complete view of the design, without losing the details.

Real problems when creating a GDD

Consistency between mechanics, systems, and levels in a game design document

The GDD loses consistency with every change

Problem

When a mechanic changes, systems, levels, progression, and rules may change too. If the GDD does not show those connections, the design can start breaking without it being obvious.

How Mainloop solves it

Mainloop helps keep those decisions connected so you can review which parts of the design are affected.

Game design iteration with living documentation

Ideas spread across too many places

Problem

Notes, chats, documents, references, and old versions make understanding the real state of the design take more energy than designing.

How Mainloop solves it

Mainloop centralizes design in clear modules so the GDD stays useful during iteration.

Modular structure of a living game design document

Documentation stops representing the real game

Problem

A static GDD becomes obsolete when the project changes. If nobody updates it, it stops being a design tool.

How Mainloop solves it

Mainloop treats the GDD as living, editable documentation connected to the real process.

A real workflow for game design

Game design is not linear. Mainloop helps keep relationships between decisions, mechanics, systems, and levels visible.

Idea
GDD
Mechanics
Systems
Levels
Validation
Production

Think

Define the concept, genre, core loop, fantasy, and first design decisions.

Structure

Turn the idea into a clear, connected game design document that can grow.

Iterate

Adjust systems, levels, and mechanics without losing design consistency.

Validate

Review the impact of every change before it reaches production.

Resources to design with more clarity

Explore how Mainloop helps organize GDDs, level documentation, role-based decisions, and game design workflow without losing creative context.

Documentation

Game Design Document

Learn how to create a useful GDD to organize vision, mechanics, systems, levels, and design decisions.

Explore GDD

Level Design Document

Create a useful LDD that connects intent, spatial structure, mechanics, and progression.

View LDD

Roles

Game Designers

Organize loops, mechanics, systems, and design decisions as a coherent working foundation.

For game designers

Level Designers

Connect areas, levels, blockouts, puzzles, and progression with the rest of the GDD.

For level designers

Game Developers

Turn design decisions into clearer context before implementation starts.

For developers

Workflow

Mainloop Flow

Move from initial idea to living documentation, organized modules, and design ready to move forward.

Mainloop workflow

Why a living GDD matters

Mainloop

When a game grows, design becomes fragmented. Ideas stay in notes, mechanics change, systems contradict each other, and levels lose intention.

The problem is not writing more documentation: it is keeping a clear source of decisions.

Mainloop exists to sustain that clarity. It does not replace the designer’s judgment.

It makes it more visible, organized, and easier to review.

Living documentation so the design can move forward without losing context.

GDD Memo mini game about game design concepts

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Real processes, design decisions, and lessons from building Mainloop