VGMarket runs video game focus groups for kids and adults of all ages. Video game developers are good at what they do, but they’re not mindreaders! They want to hear from gamers like you to make sure their games are good before spending millions developing them. Fifty bucks or a free game or two is a small price to pay to make sure a new game has everything you want!
They have done playtests for kids as young as 6 (they really helped us out with Littlest Pet Shop) and adults as old as 60. Any playtester under 13 must have a parent sign up on their behalf.
There is no charge for participation. They pay you!