Breakable only by explosives example

A simple map on how to make a breakable that only break when an explosive is used. This is done with a func_wall_toggle (the door), that is triggered by a func_breakable (the explosive crate) wich has the "Trigger only" flag enabled. As you can try, this box cannot be destroyed with weapons like the crowbar or the pistol.
There are hidden small invisible breakables that, when broken, destroy the explosives crate and consequently, destroy the door. I'm not sure if i made myself clear, so i'd recommend you to take a look at the example map.