Build mobile games and game-like interactive experiences in React Native and Expo. Use when Codex is creating or refactoring arcade, puzzle, casual, action, physics-based, or animation-heavy gameplay, including Expo game setup with the with-reanimated template, sprite-sheet generation and extraction, frame-based animation, touch controls, simple collision and physics loops, score and game-state systems, and cross-platform verification on web plus iOS and Android.