This is Opfor Installation. Which is a full version 1.2. And it includes also the Capture the flag for those who want.This also includes the map from other maps which can be supported by original half-life 1 (not half-life source or garry's mod) You can download original half-life 1 on steam.since this also works on HL-Won and Hl-Steam as well as NonSteam. Trinity Notes : This mod dosen't work on Trinity.Since the better thing that you can do is don't test this in trinity. That thing better you can do is dont test it.this was released by Valve and Gearbox Studios.And i upload it. Have fun! Pls Comment! And Don't Say this is compliment,bad,crashes my game.Because when i try there is no bug and crash ingame as well.