Half-Life: Alyx is coming in March, and Valve are celebrating early by making all games in the Half-Life Series FREE to play for Steam users, from now until the day it launches!
- Team Fortress Classic
- Half-Life
- Half-Life: Opposing Force
- Half-Life: Blue Shift
- Half-Life: Source
- Half-Life 2
- Half-Life 2: Episode One
- Half-Life 2: Episode Two
