Following Half-Life's release, the engine powered future titles developed by or with oversight from Valve, including Half-Life's expansions, Day of Defeat, and multiple titles in the Counter-Strike series.
Efter Half Life's udgivelse udviklede de motordrevne fremtidige titler, der blev udviklet af eller med tilsyn fra Valve, herunder Half Life's expansions, Day of Defeat og flere titler i Counter-Strike serien.