1998. HALF-LIFE sends a shock through the game industry with its combination of pounding action and continuous, immersive storytelling.
NOW. By taking the suspense, challenge and visceral charge of the original, and adding startling new realism and responsiveness, Half-Life 2 opens the door to a world where the player's presence affects everything around him, from the physical environment to the behaviors even the emotions of both friends and enemies....
Absolute classic, revolutionary game, one of the earliest to have a physics based gameplay. Half Life 2 came out back in 2004, and it still holds up pretty well in terms of graphics, gameplay and story.