How to use Replit Agent to build a ghost game

Ruth Heasman used Replit Agent 3 to build SpookSeek, a phone-based ghost-hunting game. Expo Go could not provide the native ARKit or ARCore capabilities she originally wanted, so the game used gyroscope orientation to position ghosts around the player.

The Three.js view mapped phone direction to ghost azimuth and elevation, with a radar, compass and capture interface. Quaternion drift and coordinate mapping took repeated investigation; Heasman reports that changing to Claude Opus within Replit helped resolve the motion problems. The resulting effect was an orientation-based illusion rather than tracked physical surfaces.

The game added free-play waves, a story campaign and Socket.io multiplayer races. For smoother play, its engine kept frame-by-frame state outside React and sent throttled updates to the interface instead of rerendering the whole screen on every frame. Custom shaders supplied the ghost appearance.

Heasman tested on compact iPhones as well as larger devices, finding safe-area and clipping problems that required changes. The outcome was a full playable ghost game with several modes, according to the original account. Its transferable details are the fallback from unavailable native AR to motion controls, the separation of rendering from UI state and the need for actual device testing.

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Source: LinkedIn · Ruth Heasman