Summary: I now own several wii games that are a collection of minigames - carnival, minigolf, funfair etc, all of which have been great fun for family members of all ages. Wonderworld strikes me as being harder than it's peers, so the 7+ age classification is a fair reflection of this.
Conclusion: this game was much better then i thought. I thought it was going to be like Carnival games, but it is much better. The graphics are better and the games are much more playable. It keeps you coming back for more to unlock the final games.Also great use of the wii remote throughout