In each screen, you will be presented with a pattern of grey sticks and bridges. The idea is to help Zen to paint all the sticks blue - then, using Zen's magic to set a ROTIX into action make all the sticks collapse on top of one another.
Once all the sticks have been cleared you will move onto a new screen. There are two aliens present in each screen which, if they touch you, will drain 100 units of time from the clock. If your time runs out, you will lose one of your three lives.