This is a commentary for this speedrun,    • Opposing Force 19:23 speedrun by quad...  

It's hard for me to know whats obvious and whats not. So if you still have any questions, post a comment.

00:17 Early shotgun, cred to PSXDooMERR    • Video  
09:18 Early M249 machinegun
10:05 Savelooping to spawn ammunition
10:42 M249 machinegun boosting
17:12 Displacer (portal gun) shortcut trick
18:24 Tripmine elevator
22:18 quadrazid vs. Spider-Waffle
23:16 Bypass Apache
27:09 OUTTAKES

Info:
http://sourceruns.org/index.php/topic...

Programs used to explore maps:
Valve Hammer Editor. Decompiler: bsp2map
BSPviewer