There are 12 balls. But one of them is different in its weight! It could be either more or less weight than the other balls!
It is always possible to determine this ball in three tries !
Just mark the ball you want to weigh and click "drop" on the balance. If you have enough balls on the balance just click "Weigh" on the balance. If both sides are equal nothing will happen ;-) Use the combobox above of every ball to set current weight status. If you think you have the solution, 11 comboboxes are set to "Neutral" and the last one has either "LITE" or "HEAVY". Then push the "Solve" button..have a lot of fun ;-)