These are all excellent suggestions. I'm definitely going to apply all of these suggestions within the next few days.
Point #3 does bring up an issue, however. The more categories I add that aren't defined by shape, the more puzzles there will be that fit into more than one category. All of the "Hole" examples that you've suggested be moved to "Beads/Balls" fit in both categories since they all contain moving balls which require a hole to move them around. Another perfect example of a crossover is the Orb-It
. Both a "Sphere" and a "Beads" puzzle.
I have been trying to follow an informal guideline when making decisions like this, although I don't always remember to apply it at the right time. If there is no obvious "group" of similar crossover puzzles already in one of the categories, I generally just put it in the least populated category. I realize this is rather arbitrary, but if anyone can suggest a clear cut set of guidelines, I should would like to read them! I guess I need a classification flow-chart to keep it straight!
Anyway, the changes you've suggested in point #3 are consistent with my arbitrary guideline anyhow, so I'm definitely going to move them regardless of the crossover issue.
Thanks for all the hard work, Oscar! Your suggestions are going to clean things up quite a bit.