Half-Life 2 SP Retaliation Map

professor. You play the part of a scientist, making a desperate effort to make your way to the compound's basement while the troops frantically search through the facility's files and computer harddrives. Find the professor's secret lab, recover the weapon before the combine can get their hands on it, and then fight your way out of the building in order to save your own life and the hope for the rebellion.
Combine troops have stormed a weapons research facility in order to capture the plans for a highly secretive and powerful new weapon being developed for the rebellion by an ingenious