Just in case you were wondering, yes, you can make Grand Theft Auto in Disney Infinity. Just don't tell the children.
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Has Disney started uploading user-created levels yet? Haven't played in a few days.
I haven't messed much with the Toy Box myself, but the lack of a 'win state' for Toy Boxes seems like it might hold it back from full-on LittleBigPlanet greatness.