1998. HALF-LIFE sends a shock through the game industry with its combination of pounding action and continuous, immersive storytelling. Valve's debut title wins more than 50 game-of-the-year awards on its way to being named "Best PC Game Ever" by PC Gamer, and launches a franchise with more than eight million retail units sold...
Start with HL2 on normal difficulty. Then do 2E1 and 2E2 on normal difficulty.
Then repeat all of that on hard.
Then you’ll be where I am. Never bothered with 1.