Been doing it for 15 years now and still haven't seen another person do it in person. Tried the 5x5 organically and got it all but one face. I have a few floating around the house and if I'm ever on hold, or waiting for a minute or two I will knock it out. It may only be every few months but haven't forgotten it for over a decade! Sometimes I may need to do a step or two over, but always can get it done.