Play all Half-Life games free for two months on Steam

All Half-Life games are free to play for two months on PC, in anticipation of the upcoming Half-Life: Alyx. This includes Half-Life, Half-Life 2, add-ons, and more. Click to the game you want and you will see an option: "Play for free! Ends in 2 months"
https://store.steampowered.com/se…=half-life
You will not be able to keep the games after the free-to-play period ends.