Touch o mobile device(touch left side of scree for sigle jump ad touch o right side for double jump).
Use mouse or keyboard (left ad right arrow key) o PC.

All you have to do is to jump on the platforms and avoid falling by jumping over holes. You have normal and double jump and you should use them wisely to progress. There is also a time limit and you will lose the game if you run out of time. So you must collect the clocks that you find on your way to increase your remaining time and be able to climb higher.