Causality

The first level is an office (with the obvious suicidalist stood on the roof staring into the abyss... give him a shove), the second a seaside toilet block sort of place, and the third is a military complex of some sort.

In each level you have to click things in a certain order so that all of the stickmen die. This has to be achieved without one of the other stickmen seeing them. There's some funny cak-based action in the second level, and the third level is genuinely tough.

Click things to make things happen.

Some clicks will trigger a longer set of actions giving you time to set other things in motion in the interim.