Zack Zwiezen writes, “It seems like just yesterday when Valve announced a trilogy of expansions for their super-popular PC game, 2004’s Half-Life 2. But its actually been 15 years since Episode 3 was announced. And while Valve has since released a new Half-Life game, it wasnt the one the developer announced back in 2006.”

Source: N4G PC 15 Years Ago This Month, Valve Announced Half-Life 2: Episode 3