Download Mission Improbable Patch - Source SDK 2013

Ready to take Gordon Freeman on a new journey? This mod presents players with a brand new campaign full of new threats, twists, and turns. Freeman is given the task of reactivating a resistance listening post, but things are never so easy. Before Freeman knows it, he’s caught in a new and desperate conflict as the Combine once again attempts to stop him. Fight your way through familiar enemies in a beautifully detailed new environment in this campaign that easily spans over two quality hours of gameplay.

Credits: malortie