Source: CVG
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"We could make two-hundred maps and people would play five of them, over and over," project lead Robin Walker told us when we visited Valve recently. "So what do we get if instead of producing a load of maps, we produce one map that's different every time?" Well, it's complicated, so we'll let him explain it - watch the video.
We're leaving Robin to explain this because we wanted to spend our full preview talking about what the game's actually like to play. That's in this month's PC Gamer, and will appear here on our CVG subsite later in the month.