W A S D
or the arrow keys to walk. W / ▲ goes forward, S / ▼ back, A / ◀ left, D / ▶ right — the same way your view is facing.

Drag
with a mouse or a finger to look around. The world keeps going in every direction.

Click or tap
anything that glows when you point at it. Buttons, levers, gates and machines all react.

Grab & throw
press and drag an object to pick it up, then let go to toss it. Things have real weight.

P or ▶
replays the demonstration in the phase you are standing in.

Number dots
jump straight to any phase — or use Back / Next at the bottom.