Welcome to the future! There are no construction workers in the building trade anymore, but instead there are robots that work faultlessly and efficiently. They have one disadvantage, though: they don't have fear of heights and due to this they can easily fall into the depths. That's why you let some older robots climb the building, to make things a bit safer and collect nuts and bolts. They can move from platform to platform via orange beams, that you can pick up and put back in a different place. The robot stores these beams into his battery, but there's only limited space. So you can't carry an unlimited number of beams with you: only carry beams with you in the lengths you'll need.
Click to move your robot to another platform and to pick up or place beams.