A devilishly clever way to torment loved ones. Money (coins or notes) can easily be inserted into the centre of the cubic maze. But to make a withdrawal from the money bank the large ball bearing must be guided around the tricky six-sided maze & into the locking device which allows the door to open. There really is no other way of retrieving the money (other than perhaps a sudden impact with a heavy object). It's large, sturdy & stylish enough to adorn desks & bedrooms long after the puzzle has been solved.