Last week I was was aked the question. "What percentage of time in a course should be spent playing games?" My response was, "Let me answer that in reverse, how much time should you spend giving lectures?" Today, I happened on Sharon Boller's blog post on Td.org Suggesting another refinement.
In it she distiguishes games for review and recall and games where the learning is central to the game as in a simulation game. Worth a read. She has good research backing her work.