This is only partially related, but one thing that confuses me is that after you click ‘check my work’ and it shows you your work colored with ‘missing’ and ‘correct’ in blue and green, respectively (there is a red box labeled ‘incorrect,’ but since it isn’t the tutorial nothing is shaded red). The bits that are marked in blue are the parts that are already colored when you start the cube, and what I presume to be the parts that others have already identified. I assume that the green parts are what you have added beyond what others have identified. That being the case (I presume, please correct me if I am wrong), it would seem that the color labels need to be titled differently as the words used do not match what the colors indicate. Also, if you right click on the green areas you can turn them blue – what are you doing when you do that? Removing things that upon review do not seem to be part of the cell? You can also turn them green again by right clicking (or clicking; I forgot, as I have not played since last night, and that was my first time).