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Camo Modification Den is a building in Bloons Monkey City. It costs $4000, uses 20, takes 12 hours to build and gives the user 200 xp upon completion. It is used to research Camo Modification Tech and to send Camo Bloons in MvM. Its animation shows a green bloon coming out of the first tube, get sprayed with camoflauge paint and go down the second tube.