Summary: Our kids played through the game once, which only took them a few hours, and then never played it again. Compared to 5-star games like Mario Galaxy 2, Super Mario Bros. Wii, etc. this game just doesn't have what it takes to keep them going back to it.
Summary: A gift for my 9 year old son, he loves it. He thinks the cartoon is great, and has a blast with this game. Each level is a different summer project, and he loves completing each one (he especially thought the rollercoaster that goes into space was awesome). Great buy.
Summary: If you (or your kids) like Phineas and Ferb, this is a continuation of their movie (http://en.wikipedia.org/wiki/Phineas_and_Ferb:_The_Movie_%E2%80%93_Across_the_2nd_Dimension) Across the Second Dimension in video game form. The game play itself is not very difficult and it can be a bit repetitive at points, so don't expect and epic adventure out of this game.
Summary: It is a little hard for both my kids who are beginners to their 3ds (age six) but they both think its great I worry that older kids who could do it would be thinking that Phineas and Ferb are too childish but not sure on that one.