How do I make stuff blow up (func_explosive)?
You can make any basic brush (or multiple brushes) explode. Its amazingly easy. Simply highlight the brush (or brushes) you want to blow up, then right-click and choose func->func_explosive. That’s it. Now all you have to do is set some options to make it behave the way you want. Select your func_explosive and hit “N” to read all the various options. They are all pretty self-explanitory. The main one’s you’ll want to use are: Noise, Dmg, Health, Mass and Type. The spawn flags (the check boxes) you’ll be interested in are: Touchable, Explo and Dynomite. All of these options are explained in the properties window.