Designed initially for Microsoft Windows and later brought to other platforms such as PS2 and OS X, the game uses a considerably modified version of the Quake engine, called GoldSrc. The player takes the perspective of the scientist Gordon Freeman who struggles to escape an underground research facility after a failed experiment causes a massive alien invasion through a dimensional rift. This week's Half-Life giveaway doesn't appear to come with any new free-to-play marketplace tweaks, which is probably for the best.Half-Life, stylized as HλLF-LIFE, is a science fiction first-person shooter developed and published by Valve. Dota 2 launched in 2013 as an inherently free-to-play game, while popular online shooters Counter-Strike: Global Offensive and Team Fortress 2 eventually received free-to-play updates. Valve's free-to-play history mostly revolves around games that function as an online service. But if you missed those sales, or the series' PC-gaming heyday, it's hard to beat the low, low price of 'free.' (And if you've never owned a Half-Life game before, check out the endless rabbit hole of amazing, community-developed mods for both games that you can download and enjoy for free.) Valve has frequently discounted the ever-living dickens out of its most classic series, with each of the series' disparate releases plummeting to $1 each during various sales. Since the games, and their connected expansions, have been available for so long, this promotion may be moot for many Steam users.

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