Build really cool Lego robots, and then control them with your tablet? Yes, please. Lego Boost ($160 on Amazon) is aimed at kids ages 7 to 12, so I was a little worried that it would be too hard to enjoy with my son—he’s 5 (and a half!) and just started kindergarten. But while I had to direct the complicated builds, controlling the finished robots and vehicles with the iPad app was well within his grasp—and so much fun for both of us.