Valve Univesre: The Game

Plot
The Source (egine that runs all the games and Steam) has brought all the Classes from the Dimensions to battle in Counter-Strike-like map shooters.

Classes
TBA
 * Heavy (TF2)
 * Demo (TF2)
 * Spy (TF2)
 * Medic (TF2)
 * Pyro (TF2)
 * Scout (TF2)
 * Sniper (TF2)
 * Soldier (TF2)
 * Egineer (TF2)
 * Survivor (L4D)
 * Infected (L4D)
 * Portal-Gun user (Portal)
 * Gravity-Gun user (Half-Life)
 * and More!