Now you can get up to date on this older series before it makes its big comeback.
That's not quite everything, however; Valve is also including original Half-Life expansion packs Opposing Force and Blue Shift (both created by Borderlands studio Gearbox back in the day), plus Team Fortress Classic for those hankering for a bit of multiplayer nostalgia.
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All Half-Life offerings including The Orange Box still show pricing, so it's possible Valve will put the event live later today or sometime this week, unless there was a mistake.
There's a motive besides just generating publicity for Alyx. Still, any excuse to play Half-Life, whether at a discount or for free, is a good excuse. While I'm sure there are franchise devotees who replay the series constantly, or the occasional neophyte who discovers it late, most of us won't have played a Half-Life game much since the last game came out. Set between the events of Half-Life and Half-Life 2, in the game Alyx and her father Eli "mount an early resistance to the Combine's brutal occupation of Earth". Thus, the old games are being made available for everyone to play for free before the release of the new game so that players can get maximum enjoyment out of the new game. We're still waiting for an official Steam blog post or "collection" page to link to, but in the meantime, you can claim the limited-time offer at each game's individual Steam page (collected at this page for now). Also, it's a chance to play more Half-Life, and though the series is so enshrined it's nearly more legend than actual game at this point, that will never be a bad thing.