The URL (http://DungeonsandDragons.com/codes) currently redirects to the main D&D page (Dungeons & Dragons Roleplaying Game Official Home Page)
NOTE: the card has the redemption code necessary to download the adventure, just going to the URL above will not allow you to download it. (That is, if it resolved correctly.)
I just wanted to add that the link works now; I've got the PDF, an adventure for one 1st-level player that supposedly uses the rules in the red box.
ETA: The adventure uses the same choose-your-own-adventure format as the character-building adventure in the Player's Guide. No DM needed.
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