| P | Pause / resume |
| R | Reverse direction (motor / clock time) |
| Space | Hold to turn the hand crank |
| W | Wind the spring (barrel motor / clock) |
| E / X | Exploded view / X-ray of housings |
| F | Macro focus (fake depth-of-field) |
| 1–6 | Camera presets |
| L / N / Q | Gear labels / sound on-off / quality |
| Del | Remove selected gear (Workbench) |
| Mouse | Drag = orbit, wheel = zoom, right-drag = pan. Touch: one finger orbit, two fingers zoom / pan. |
| Workbench | Drag a gear from the tray onto the brass plate — it snaps onto pegs and to the correct centre distance with neighbours. Drop onto an occupied peg to build compound gears. Click a gear to select it, drag to move it, then press Drive to attach the motor. |
Click anywhere or press H to close.