Never heard of that Jason guy so have to say Bruce.
Pele.
Never heard of game of life either so have to say monopoly.
As for Ritalin, I've heard from adults that used to take it and I watched a Panorama programme about ADHD and it does have bad side effects. According to the programme it actually made the kids worse after prolonged medication on it. I'd try and follow legends advice and cut out all snack foods, sugary drinks and frozen/tinned food as they always contain loads of sugars and e numbers.