We have started setting the kitchen timer for DS6's Nintendo DS time. It has really helped for him to hear the beep--beep--beep when his time is up. I usually let him have 30 minutes on school nights and frequent 30 minute play times on the weekend. I think he should take a break after staring at the small screen for 30 minutes straight.

My DS6 is also obsessed with completing every game he owns. IMO, I didn't want to ban it because it would only make him want it more. I do, however, use the Nintedo DS as his first line of punishment and it does seem to be the first thing that he truly cares enough about to actually remorse about his behavior.

Crisc