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I haven't had an exactly comparable problem of one student sabotaging the games, but I certainly have some students who seem to be way ahead of the other students. What I have done is let them play the game and once the have won a couple of times at that game I get the to assist in some way as has been suggested. For instance if I am playing Simon Says they get to be the person who says "Simon says ...." instead of me. This gives the bright students more of a challenge while leveling the playing field in the game.