thx it works

It's all about timing. You hold on to the cube with your left hand. Grab the zipline with your right. Hold on to it for a very short time. Release right hand and right after you release your left hand. So: Hold left, Grab right, loose right, loose left. The timing is that you have to let go of both hands when you are going upwards on the zipline. Hope you can work it out :)

how do u use the catapults?