Mainloop AI

Game design enhanced with AI

Design your game in one place, from your first idea to the development handoff. Organize what you need, learn by doing and use AI to explore ideas and review your decisions.

Start designing See how it works

Free trial: your first game with AI + 2 requests or changes within that game. For new accounts with a verified email, no card required.

From idea to GDD to your agent

You create and direct. AI supports you when you need it.

Idea
Your game idea
Prototype
A complete GDD to start building
Living design
Connected GDD, LDD and modules
Handoff
Files and prompts for agents
Iteration
Your design evolves with you

The prototype is enough to start building. Mainloop prepares the design and handoff; the game is implemented in your project.

Why Mainloop

Design with context

Design changes. Context should not get lost. Three frictions appear in almost every project. Mainloop turns them into visible relationships and decisions you can follow.

Separated amber gears beside connected blue gears: relationships between game design decisions.

Common situation

Changes ripple outward

A mechanic changes, and systems, levels, progression, and rules may need to change with it.

What changes with Mainloop

Visible relationships

Mainloop shows those relationships so you know what to review before the design loses coherence.

Scattered amber notes beside an organized blue design notebook: game design context gathered in one GDD.

Common situation

Scattered decisions

Ideas, references, and agreements spread across notes, chats, documents, and old versions.

What changes with Mainloop

Your design in one place

Everything returns to connected modules: one source for understanding the real state of the game.

A closed notebook and loose pages beside an open blue GDD incorporating new design decisions.

Common situation

Outdated GDD

A static GDD stops reflecting the game as soon as scope, playtests, or implementation change.

What changes with Mainloop

An evolving GDD

The living GDD evolves with your decisions and preserves useful context for design and development.

One living GDD, one source

Your connected GDD

Your whole game design in connected modules: concept, story, characters, rules, worlds, audio and resources. From Prototype to GDD and LDD, with Development and Management to bring your decisions into your project and team.

Two ways to design

Start with the whole game, then explore every detail. Build your GDD’s structure in Live GDD: add elements by name and see how they fit together. Then develop each one in Modules. All in the same GDD.

GDD modules

Design modules preserve the intent of the game. Planning, implementation and presentation tools use it as their source of truth.

Prototype

Define the minimum playable prototype and its main tasks. Export the complete prototype with instructions for your agent, and add extra direction if you need it.

Essentials

Organizes high concept, genre, tone, design pillars, player goal, and overall intent.

Story

Aligns story, tone, context, scenes, and narrative progression with design.

Systems

Connects progression, economy, combat, resources, abilities, and dependencies between rules.

Mechanics

Turns ideas into actions, limits, rewards, feedback, and verifiable rules.

Characters

Defines roles, behaviors, functions, and how characters relate to the playable experience.

Loops

Defines the core loops, motivation, rewards, friction and pacing of the game.

Puzzles

Defines challenges through rules, logic, sequences, clues and how players understand them.

Audio

Define sound effects, music, ambience and voice. Upload compressed audio and export the files with their manifest.

Tasks

Turns GDD decisions into actionable work to implement, review, or produce.

Engines

Select GDD and LDD, tasks or both. Download one ZIP with context, instructions, tables, scripts, audio and optional validations. Copy handoff instructions for your agent. Prototype keeps its own delivery. No automatic agent or Unreal connection.

Testing

Derives test cases from the design and task criteria. Record results and evidence; downloading a handoff or marking changes as applied does not validate the work.

Mainloop tools

Your game design, in one place

Bring ideas, references and resources together, organize the work and prepare handoffs. Work across the modules with your game's context at hand, and use AI whenever it helps.

Design with AI

Connect your game's ideas and design decisions. Ask for improvements, review contradictions across your GDD and decide which changes to apply before you keep creating.

References and resources

Keep images, annotations, assets, audio and links alongside the design. Keep references at hand and see what each resource represents within the GDD and LDD.

Text and voice queries

Ask questions and request changes to your GDD from one place, without navigating module by module. Type or talk to AI to move forward with your game's context in mind.

Prompts for agents

Take your game's context into other tools. Copy prompts for images and agents, and prepare tasks, exports and a brief to keep building your project.

Loopa

Your GDD, always within reach.

Choose a module, element and field with Loopa’s nodes. Write the new value and confirm the change in your GDD.

Free direct editing. Optional AI for conversations and proposals; you choose what to apply.Open Mainloop and meet Loopa

Blue-haired Loopa standing on her grid, helping you edit your game. — Local editing example · No AI queries used

For people making games

A GDD for everyone

Anyone designing or developing video games can use Mainloop as a central tool for ideas and GDDs. Game designers, level designers, developers, artists and producers share the context, working solo or together.