Well 2D typically is more easy to digest than 3D for someone really young. I'd highly suggest SMB6 here this topic is about, but if he can hack 3D Galaxy is fantastic too. Klonoa is a VERY fantastic and underrated Wii title that got no love, and also from Namco too 'The Munchables' which someone his age or ours would love greatly. Beyond that I dunno as I don't get a lot of younger gauged 'all ages' stuff leaning in the direction of Spongebob and shit so I dunno.