A plagiarism game from Lycoming College, USA, Goblin Threat, involves finding goblins and defeating them by answering plagiarism-related questions correctly. This is a nice idea that has been implemented well, so worth checking out. If you clear the goblins from all the rooms you get a certificate. My only little quibble would be that (as with most plagiarism quizzes) I think with a few of the questions the answer is not as black-and-white as is implied (it could also be to do with differences in national and institutional practices). http://www.lycoming.edu/library/instruction/plagiarismgame.html
I discovered this game because it was a Primo site of the month: http://www.ala.org/ala/mgrps/divs/acrl/about/sections/is/projpubs/primo/site/2010october.cfm. In this interview the game's creator explains how the game arose, how it was tested, and how it is used now, so it is also worth readng.
Photo by Sheila Webber: Winter branches, December 2010, photoshopped (neon glow)