Half-Life 2 is available now for purchase and to play. Those who pre-purchased their copy via Steam may access the game by restarting Steam, then double-clicking on the Half-Life 2 icon in their Steam Games directory. To purchase your copy via Steam, get Steam now.

That's righy guys... The moment we've all been waiting for. Steam unlocked HL2 and now we're ready to play. I've already purchased my copy and pre-loaded via Steam. Hurry up and start playing...

STEAM

Thanks to BatKnight