Bart's tree house does not unlock...?!?!
Check in your task book to see if you have any other tasks that might need to be completed. Not sure but I think build the library has to be completed and maybe a 4 hour to have Bart skateboard. Lisa and Millhouse have to have completed the 6 hrs task. Sometimes just a trip to Krustyland and back will sync the game and make things kick in.
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