LOL - sounds like my DS7 all right. He often changes how he plays a game so as to deliberately lose. I wish I knew why - perfectionism? because he's bored? He won't say of course!
Last weekend we were bowling with my in-laws and he decided he was going to lose at bowling, so he rolled the ball as slowly as possible down the lane. Made for a slooow game. ;-)
Elizabeth - thanks for the suggestions. The Tetris game is this one:
http://www.amazon.ca/Unknown-01600-Tetris-Link/dp/B005RBVE8EI did convince him to give the Moose game a try, but of course he decided he wanted as many moose as possible in his house. LOL!