I wondered how you see Puzzle 5 as an illustration or example of entropy. A couple of definitions, or excerpt from a definition, of entropy say that it is “often interpreted as the degree of disorder or randomness in the system” and a “lack of order or predictability; gradual decline into disorder”. The goal of the puzzle is to produce an ordered sequence, however, the opposite of entropy. I think titling the puzzle “Entropy” is an incorrect use of the term, and misleading. What am I missing?