This handles the core systems work for Unity and Unreal projects: ECS architecture, physics setup, multiplayer networking with lag compensation, and performance optimization to hit 60+ FPS targets. It comes with validation checkpoints that won't let you proceed past implementation until you've profiled frame times under 16ms, which is the kind of forcing function that prevents shipping janky builds. The code patterns cover object pooling, component caching, and state machines with actual working examples rather than pseudocode. If you're building game mechanics and need someone to remind you not to instantiate in Update loops or use Find in hot paths, this enforces those constraints explicitly.
npx skills add https://github.com/jeffallan/claude-skills --skill game-developer