Someone chime in if I am wrong, but I believe that Sorcerers of MK is a "game" you can play in the MK. It involves decks of cards and visiting various spots in the park by solving "clues". You pick up your cards and learn the rules of the game by visiting the firehouse on Main Street, it is tucked away to the left as you enter the main gates. My family played and enjoyed it, but we didn't find out about it until our last day at MK. It is free to play and anyone can join in the fun.
Kingdom Keepers is a series of YA books that are based in the Magic Kingdom. As far as I know, there are no related attractions at WDW.