Okay so its Little Big Planet, but its pretty awesome, actually. A 3D sorta 2D platformer puzzle game with layered depth and online scores and collaboration and gestures.
Yes, gestures. Playing a game and being able to make your character dance or give thumbs up or stick his tongue out is remarkably entertaining on its own. Even more so when playing in a group with friends online.
Now, I've got a little more LBP experience than many people these first few days after its launch since I was in on the beta and got to play it with friends and family then too. My daughter is only 6 and loved it, especially playing community levels and then assigning words to describe them.
The community aspect of the game is very well done, and this is most apparent by how upset everyone was the last day or so with the servers not connecting well -- it really affects things being able to play together and share levels.
Yes, you can create your own levels, with logic and puzzles and stories and characters and movement and vehicles and and and ... its very complex and huge and entertaining if you're the creative type.
Speaking of playing online though, in case anyone else ran into this problem, I had to port forward UDP port 56759 on my router to my PS3 to invite friends into my session. It would appear LBP doesn't make use of UPnP port forwarding functionality, which is somewhat disappointing.