Half-Life 2 Mistake Of Pythagoras Mod (v1.0c)

You are Gordon in a parallel world. The city is now under attack from unknown enemies. You have to find out a way to stop the invasion by traveling into their world and correcting the mistake.
================================================================ HALF-LIFE2 - Single player game mod ================================================================ Title : Mistake Of Pythagoras Version : 1.0c Game : Half-life2 Author : K.S.(K