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Contraptionist
Created your own level
20 
Chopper Pilot
Collected all stars in The Treehouse
20 
World of Contraptions
Completed a downloaded level
20 
School's Out
Completed all levels in The Classroom
20 
Lawn Mower
Completed all levels in The Backyard
20 
Bedtime
Completed all levels in Alex's Bedroom
20 
King of the TreeHouse
Completed all levels in The Treehouse
20 
Book Smart
Collected all stars in The Classroom
20 
Knockout
Collected all stars in The Backyard
20 
It's Not Easy Being Green
Collected all stars in Alex's Bedroom
20