Summary: If your kid likes the show, they'll like this game. It's fun to play with my 7 year old, though he did finish the entire thing in a weekend, so I was disappointed that it finished so fast, but we fire it up every now and then and replay some of the levels. Definitely fun game, wish it was longer though.
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.