Keys:
[W] : drive forward
[S] : drive backward
[A] : steer left
[D] : steer right
[F9]: reset
Mouse:
If the line is visible, the crane will try to turn to the angle of the line. If not, the position is out of reach for the crane. As long as no line is shown, the crane will rest were it is.
Hold the left mouse button and drag the mouse up or down to lower or raise the crane. The line tells the aimed height of the crane. If you hold the left mouse button and move the mouse left or right, you will rotate the magnet.
Hold down the right mouse button and drag the mouse to change the point of view
The line is yellow if it is not hidden and red if it is.
The crane's magnet is red if it is not switched on and yellow, if it is grounded.
If the magnet is green, it means that it picked up a piece and if it changes to cyan, it means that this piece is no longer grounded.