I handed this to a 12-year-old and am now having trouble getting him off the site for day #2 in a row; between Space Elevator and the rest of Neal.fun it's a wh

I handed this to a 12-year-old and am now having trouble getting him off the site for day #2 in a row; between Space Elevator and the rest of Neal.fun it's a whole new world for him - love it!