My little girls have had this game for several weeks and are still stuck at the begining of it! The game introduces Giselle, and quickly runs through her role,... and then you meet Edward. The first thing Edward has to do is kill trolls but leave his energy intact. My girls cannot get past this stage, which is only the second stage of level one! I would say the level of ability needed to play this game would be similar to Super Mario games.If your child is more of a 'animal/pony ds gamer' they may struggle (like mine) to keep up with the pace with this game.
Having said all that, the graffics and humour are brill, and in more experienced hands, this would be a really good game.