The books by Raymond Smullyan have caught my fancy because they seem to teach mathematical logic using puzzles. However since I am very weak at solving puzzles in general and logic puzzles in specific, his books are giving me a hard time.
Could you please suggest in what order should I start reading his books so that the level of complexity is as gradual as possible? If you think that there is some other book/topic I should study first, please feel free suggest that as well.
Note - I don't want to start studying books on mathematical logic because I won't be learning to solve puzzle while doing that.