In my opinion its a bad design Marco.
Its not going to be very bright, because the current from up to 16 leds would have to be sourced/sunk by one Arduino pin.
There is only one series resistor per layer. There should be 16. That means that if a single led is lit on a layer, it will be much brighter than if all 16 leds on the layer are lit.
So if 16 leds are on in parrallel, sinking/sourcing current from a single Arduino output with a 500R series resistor and a 1:4 multiplex ratio... the average current received by each led will be extremely low.
It could be improved considerably with 16 series resistors and 4 transistors, but the shield was not designed to allow those components to be added.