Free 2 Months Play all Half-Life Games - Steam
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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/search/?term=half-life
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Some sites report this runs until 4/1
