Web Swing City

Graybox third-person platformer foundation with canonical PlayDrop humanoids, functional animation and terrain foot IK. Switchyard races shared-physics CPU runners through sweepers, gates, a risky shortcut or broad detour, and a combined gap finale. Switchback basin connects slopes, steps, a lift, hidden crests, a required shuttle crossing and an optional landing-chain summit with a return ledge. Includes swept actor contact, checkpoint/ranking records, creator tuning variants and keyboard/touch/Gamepad actions. Native WebGPU required. Host-owned pause releases held keyboard movement/look/jump; fresh activation is required after resuming.