Summary: 10 yo son said: There are more alien characters than all the others, and they are stronger. There are many "Ultimate" aliens you can choose from as well as some non-ultimate ones. Ultimate Humungasour is his favorite.
Summary: This game is really fun and a good challenge. However, I bought it for my almost 6-year-old son, and it's a little too complicated for him. There's a lot of puzzle solving and very little fighting your way through levels like some of the other Ben 10 games. Also, it's only one player, so I can't join in and help him like the other games. He enjoys playing it, but I have to sit and help him fairly often, which mostly turns into me playing the game by myself!
Summary: I bought this for my almost 7-year old son, who is absolutely crazy about everything Ben 10. That is for whom this game is made, not hard core gamers. (This is the review of the Wii version) That being said, it is a surprisingly solid gamer. I found the game the best of the Ben 10 Adventure games.
Summary: My eight year old son just bought this and is already hooked. Having played Ben 10 Alien Force previously and watched a season of the show, he had no problem playing all characters and utilizing their abilities. This is an upgraded game in the series and highly recommended!