What problem does it solve? Game concepts often accumulate features without sharpening the core fun, and teams confuse technical prototypes with real player-experience validation. This Skill structures the analysis of game concepts, pointed fun, systems, difficulty, combat AI, tutorials, and benchmarks so decisions are grounded in player value and evidence rather than feature count. ## Core Features & Use Cases - Concept Sharpening: Defines target players, pointed fun, and constraints, then classifies every element as AMPLIFY, SUPPORT, NEUTRAL, CONFLICT, or UNPROVEN against the core concept. - System, Difficulty & Combat AI Design: Separates individual enemy judgment, combat coordination, and difficulty/pacing direction with fairness, readability, and attack/threat budget rules. - Evidence-Gated Validation: Distinguishes internal technical spikes from release-near Vertical Slices, and converts benchmarks and playtests into ADOPT / ADAPT / AVOID / TEST / IGNORE decisions. - Use Case: When revising a roguelike deckbuilder concept, use this Skill to verify the core loop against world/story fit, benchmark comparable games, design a playtest plan, and decide whether the concept is PRODUCTION_READY, needs another Vertical Slice, or should stop. ## Quick Start Analyze my current game concept document and tell me which elements amplify the core fun, which conflict with it, and what evidence I need before committing to production.