2.5D layered mockup (Three.js). WASD move · ← → ↑ ↓ (or right-stick / click+mouse) look · C/Z frequency · E/Q dispersion · Space ping · Y new maze. Walk onto a cyan shaft to ride between floors. Radar (top-right) shows your floor; the exit is on the upper floor — the compass shows an up-arrow until you climb.