All Half-Life Games Are Free to Play Until March

Half-Life: Alyx launches in March, so Valve decided to offer anyone with a Steam account free access to all existing Half-Life games until launch day.

Best Free PC Games

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

Every Single Half-Life Game Is Currently Free To Play

Half-Life: Alyx Announcement Trailer

Half-Life (series) - Wikipedia

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Every Half-Life game is free-to-play on Steam for the next two months

News - Play Now For Free - Half-Life Series

All Half-Life games are free on Steam for the next two months

Valve cut the crowbar from Half-Life: Alyx in part because players kept assuming they were Gordon Freeman

All Half-Life games are free to play ahead of Half-Life Alyx's launch

Valve is releasing the Half-Life Collection for free in preparation for Half -Life: Alyx

The first Half-Life is available for free until November 20th [UPDATE: It's free]