This is the preview game to Dark and Light (darkandlight.com). 10,000 free keys were released at 6pm GMT on December 8th. By 6.02pm all keys were taken. This was 2am my time so I stayed up and pressed the 'subscribe' key at exactly 2am according to the internet world clock.
Tried to get a 2nd key at 6.03pm and they were all gone.

If this game lives up to its promises it sounds like it will be awesome. I am a real skeptic however. I will keep you posted.