Half-Life Series Free To Play Ahead Of Half-Life: Alyx Release - GameSpot

In anticipation of Half-Life: Alyx, Valve has made every game in the series free to enjoy until April 1.
Half-Life 2 is a very impressive and engaging shooter, and a faithful follow-up to one of the greatest PC games of all time.

Half-Life: Alyx Announcement Trailer

Combine (Half-Life) - Wikipedia

Half-Life: Alyx, Half-Life Wiki

Half-Life Games Free To Play On Steam Ahead Of Alyx Release

News - Steam Community Announcements

GameSpot gives Half-Life Alyx game of the year 2020 : r/ValveIndex

Half-Life 2 storyline, Half-Life Wiki

Complete Half-Life Series is free to play until Alyx is released

This is a 15 year-old game. : r/gaming

Half-Life (video game) - Wikipedia