It's such a shame that LanLan produces all the really cool puzzles. I would probably scramble and solve the puzzle in full more often if the plastic wasn't so hard on the fingers. After every session, I have with this cube my fingers hurt so badly just because the puzzle is hard to get going for each turn and there are a lot of sharp edges. I could imagine QiYi or Mf8 making this puzzle with super smooth turning and stickerless plastic. And there is a harsh spring noise during each turn. I'm sure solving a 21x21 would hurt less than this puzzle. It's a fun solve but frankly LanLan plastic ruins the experience.