You can get one of the best games ever for free; it has a 96 on Metacritic
The title received new content to celebrate a very special date
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New Half-Life on the way? Fans think Valve is preparing a surprise for this clue
Information suggests company could make an announcement at major event
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RUMOR: Portal 3? Half-Life 3? Valve appears to be working on ambitious unannounced game
Fans are already excited about it