Game Prototyping Toolkit
Build prototypes that answer questions instead of prototypes that accidentally become unfinished games. This 5-skill bundle helps you define prototype intent, identify the uncertainties worth testing, choose what to build first, structure the design problem, and track what you are actually learning. Use it during pre-production to find the cheapest, fastest path from a game idea to evidence that the idea works.
Works with every agent that reads SKILL.md — Claude Code, Cursor, Codex CLI, Gemini CLI, GitHub Copilot, Windsurf, OpenClaw, and more.
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What's included
5 skillsTransform raw game ideas into actionable, scope-conscious development plans for solo and small indie teams.
Convert vague game design ideas into structured decisions using the Goal, Reality, Options, and Will framework.
Audit game prototypes to ensure they actually test design risks instead of wasting time on unhelpful polish.
Identify hidden design risks and create high-leverage prototyping plans to resolve game design uncertainty.
Track game design iterations, document branching decisions, and generate visual SVG evolution maps of your prototypes.
See it in action
game dev first steps
Example session with this skill installed
I want to make a 2D soulslike platformer with a complex story about a lonely robot. I'm a solo dev with some C# knowledge but no art skills. I want to release this on Steam.
- Read your context and instructions
- Compiled the game dev first
I have analyzed your concept for a 2D soulslike platformer. For a solo developer with your specific skill set, the priority is proving the combat feel before investing in the narrative.
Idea Snapshot
- Concept: A 2D precision-combat platformer focused on a robot protagonist.
- Priority: Dialing in the "weight" of the movement and combat timing.
Team Reality
- Team size: Solo.
- Skill mix: Basic C# coding, minimal art experience.
- Strengths: Technical logic and control over the game loop.
- Blind spots: Asset creation (animations, backgrounds) and narrative pacing.
- Assumptions: You will use an engine like Unity or Godot to leverage your C# knowledge.
Recommended Development Order
- Define Core Action: Map out the robot's dash, attack, and parry mechanics in a grey-box environment.
Smallest Playable Version: Create one room with one enemy type to test if the "soulslike" difficulty feels fair or frustrating.
3. Prototype Fast: Use primitive shapes (squares/circles) for the player and enemies.
4. Validation: Test if the combat loop is satisfying without any story context.
5. Scope Revision: Determine if "complex story" can be told through environmental cues to save on dialogue systems.
6. Vertical Slice: Polish one 5-minute gauntlet with final art style (likely minimalist or asset-pack based).
What to Postpone
- Narrative Systems: Do not build a branching dialogue tree yet.
- Art Polish: Ignore custom animations until the hitboxes are finalized.
- Steam Integration: Achievements and cloud saves should not be touched until the game is 80% finished.
Biggest Risks
Asset Gap: "No art skills" is a major bottleneck for a 2D game; you risk spending months on mediocre art instead of gameplay.
- Feature Creep: Narrative-heavy games often require more content than a solo dev can realistically produce.
Best Next Steps
- Download a basic 2D character controller in your engine of choice today.
- Create a "Combat Sandbox" scene with three floating platforms and one stationary target.
- Research 2D sprite packs on itch.io or Unity Asset Store to solve your art constraint early.
Next steps
- Build your grey-box combat prototype.
- Define the specific "hook" that makes your robot's movement different from other platformers.
- Research minimalist art styles like silhouette or low-res pixel art.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
Free skills download straight away. Paid skills unlock right after purchase.
- 2
Unzip into your skills folder
Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.
- 3
Ask your agent to use it
Restart the agent if it was already running. It picks the skill up automatically - no config needed.
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Click the path to copy it. Create the folder if it does not exist yet.
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