<_title>Balance the scales properly <_description>Drag and Drop masses to balance the scales <_goal>Mental calculation, arithmetic equality <_prerequisite> <_manual>To balance the scales, move the masses on the left or the right side. The masses can be arranged in any order. <_credit>The painting is an original painting created by Virginie MOREAU (virginie.moreau@free.fr) in 2001. Its name is 'Spices Seller in Egypt'. It is released under the GPL licence.