Hi Joseph,
In the Forum 3 I mentioned several games that I use that have been very effective. Anything that generates a sense of competition works with the students. Another type of game I use is to post a mystery or bonus question on the screen during break. The screen also has a clock on it so the students see the minutes and seconds count down while they are on break. If they are on a 15 minute break, the question goes on the screen along with the clock. At then end of the break then I ask for the answer(s) to the question(s). The right answer(s) get the students bonus points. This can be done as teams or individually. What you will find is that the students talk among themselves about the possible answer(s) while on break so momentum is not lost in terms of course content even though the students are on break. Humans like to compete and this is one way of keeping them in the game.
Gary