Marble Reservoir
Connected to the Marble Tower are eight individual reservoirs, each of which initially holds seven marbles of a certain color. It is here, at the reservoir, that you will select the marbles to be dropped into the puzzle. Choose wisely.
The trays which normally hold black and steel marbles should be empty until you purchase those marbles. It is rumored that the black and steel marbles are running up and down the tower until that time, freelancing for the other reservoirs and engaging in questionable conduct. Like most beings of questionable character, be careful; they are expensive.