While the concept behind this is good, it does not work well for replacing dice rolls though if using percentile dice. The deck has a system for representing d100 rolls, but statistically is flawed, as the 5 for the single digit and the 50 for the tens digit both only occur 11 times instead of 12 like they should, while the 6 for the single digit and the 60 for the tens digit both appear 13 times.

Not sure if there is a flaw in the deck that I received, or if all of the decks have this flaw (suspect it is all of them and that maybe they were hoping no one would notice. So be warned that if you plan to use them for d100 alternative, that statistically it will not give evenly distributed random results. I did not investigate the other die types, as I generally only use d%.