Half-Life, the little-known game about a monorail enthusiast who undergoes the most brutal job interview in history, reached its 25th birthday on Sunday. And Valve was in a surprisingly celebratory mood for a company that is normally as reticent as it is forward-looking. On its YouTube channel, Valve released a brand-new documentary that brought the original Half-Life team together for a captivating chew over its development...
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