Our son is 6 and he loves all the card attacking type cartoons/toys( pokemon, Bakugan,digimon,and Yugioh(sp) He doesn't fully understand everything, but he will play forever with the cards attacking and battling each other. You can look on their website Bakugan.com and they have information on there about the toys, cartoon, and game play. IMO I think these bakugan things are too small and make no sence LOL.. but the kids like them.