My least favourite thing about the puzzles was the "hint system" which ruined the first couple of puzzles for me before I found out I could turn it off. I didn't find it very hinty more HERE IS THE ANSWER.
Favourite puzzle: Ninja Dave, because it was funny and cruel, I especially liked the olive on the sword, i mean katana.
Least Favourite: Club 41. Too easy, pick up a card and you have completed a 1/3 of the initial quest.