This year's SANS Holiday Hack challenge is obviously themed after the 'Die Hard' movies - from Hans Gruber, to the vents, and the famous Yippee-Ki-Yay!
Here are some Easter eggs found in the game:
erohetfanu.com -> ROT13 = reburgsnah -> Reverse = Hans Gruber
The code given by the BadgeOMatic scanner (19880715) is the date that
Die Hard opened in limited release in the US.
At the start of the game, you can walk out of the 'map' at the bottom right near the pine tree, onto a cloud that oversees the castle.