http://www.kotaku.com.au/2012/03/how-on ... to-an-mmo/
*excerpt*
Participation skyrocketed on the first day. I had students I never heard from volunteering to answer questions they didn’t even know the answer to. Students who normally wouldn’t even care were going out of their way to get XP from class participation. Every one of my students pushed themselves to focus during the day’s assignments and behave. One student, who earned a bronze level achievement, was even applauded by the entire class. It blew my mind. The amount of XP I was going to give out was undetermined, so I just let them come naturally. Share your maths answer with the class? XP for you. Let a classmate borrow your dry erase marker? XP for you!
*excerpt*