Reawakened from stasis in the occupied metropolis of City 17, Gordon Freeman is joined by Alyx Vance as he leads a desperate human resistance. Experience the landmark first-person shooter packed with immersive world-building, boundary-pushing physics, and exhilarating combat.
20th anniversary celebration
https://www.half-life.com/en/halflife2/20th
Comes with a long list of fixes and updates.
Episode 1 and 2 are now bundled with HL2.