Call in. A single player mod which plays out at the same time as Gordon and Alyx flees the citadel in Ep1. You take the role of a rebel soldier on a mission to retrieve information regarding the super portal to aid in the building of Dr. Magnussons rocket.
1.Download and extract with winrar. 2. Put the Call-In folder in your steam/steamapps/sourcemods folder. 3. Restart Steam 4. Find Call-In in your game list and play. Note: You will need Half-Life ep:2 installed for this to work.