The Augmented Knight's Castle (AKC) comprises traditional play figures and 
scenery embedded with radio frequency identification (RFID) technology to 
enhance user experience by triggering various forms of audio output. In this 
paper we present the results of a user study with over 100 children to 
evaluate the AKC in terms of playful learning, compared with an identical, 
non-augmented version. Findings suggest that children who played with the AKC 
remembered facts about the Middle Ages that were presented to them in the form 
of verbal commentaries, both immediately after the play session as well as in 
a post-test two months later.