(adsbygoogle = window.adsbygoogle || []).push({}); It's pretty easy. Take a sackbot, add what ever sensor you like and hook it up with both a destructor set to explode and an emitter with impact explosives ready to hit the ground and blow up. Set emitter frequencies to whatever timing you like. Then use your sensor. This is totally lame and you should use timers/counters or other stuff to improve but, eh, not my problem. I taught you the basics. Rate this down, see if I care. But if you add to it, and make more emitters of similar kind, BOOM, its awesome.