[Whistler]

I'm going to stick with HL1... just using HL1 as a testbed to learn AI programming
and as soon as I become a real coder I'll switch to some free engine, like Quake series engine (including those Quake3 engine clones). I don't want to promote proprietary engines like HL series, especially HL2 which contains quite a lot of annoying "Digital Restriction Protection" stuff.