This comment might go down like a lead balloon but I reckon Valve games should be pirated until they stop messing us around. 10 years with no news about HL2:Ep3 or HL3, no interest in making new games, they just keep cashing in on digital skins in their bug-ridden multiplayer games and store. They have shown contempt for the customers that put them where they are for way too long.

The free bonus mystery game at the moment is Unbox Newbie's Adventure, which unlike most of the other free games seems to be rather good.
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Team Fortress Classic... what an amazing game that is, went on there for the first time in over 10 years the other day can't believe there is still people rinsing out 2fort, still amazingly fun after nearly 20 years

All of the core team that wrote and produced Half Life 2, ep1 & ep2 have now left Valve, so even if it eventually gets made it won't be anything like the originals. They should have released it for exclusively for Oculus Rift when they had the chance, they'd have sold millions of the things.