well judging from what's usually on the eshop they seem to like super mario, especially the 3d ones, maybe mario kart, maybe at least one mario party, paper mario, and mario & luigi. at least as far as mario goes, i don't pay much attention to the rest
i just noticed that in "zeige dich", willemijn verkaik sings "ich kann alles sein" at the same time as sabrina weckerlin sings "du kannst alles sein." so elsa starts to believe in herself as her mother encourages her to know that she can be anything. what a beautiful song.