Thread:Vorknkx/@comment-3547390-20150418114653/@comment-1496755-20150428063412

This is HL's jet. It's considerably more detailed and realistic... but then gain, the engine is superior to vanilla Q1.

So it turns out many of the Standalone levels are map design demos of some sort. Little tutorials on making jet planes... or doors. I wonder how many more of these you'll find.