What problem does it solve? Game developers often invest weeks writing GDDs and production code for concepts that turn out not to be fun. This Skill validates whether a core game idea is actually enjoyable to interact with by producing a fast, throwaway prototype and a clear PROCEED/PIVOT/KILL verdict before any design documentation is written. ## Core Features & Use Cases - Falsifiable Hypothesis Framing: Forces the concept into a testable question ("If the player does X, they will feel Y") and targets the riskiest assumption first. - Three Prototype Paths: Routes to HTML (browser-playable, no install), Engine (native feel validation for action games), or Paper (rules document plus play log) based on genre and what is being tested. - Structured Playtest Debrief and Report: Captures hypothesis result, best/worst moments, and surprises, then generates a REPORT.md, updates a prototypes index, and records kills in a GRAVEYARD.md. - Spike Mode: A ~4-hour lightweight mode for mid-production technical or mechanic questions with no phase-gate implications. - Use Case: After brainstorming a grappling-hook platformer, run the Skill to build a minimal engine prototype testing swing feel, playtest it, and receive a PIVOT verdict with a carry-forward note before writing any GDD. ## Quick Start Ask the AI to prototype your game concept, for example: "Run /prototype on my grappling-hook platformer concept using the engine path."
