I am beginning my journey into Cryptography, having studied a theory-heavy master's degree module, and I have also read The Code Book by Simon Singh, among many other online resources.
What puzzle books would the community recommend, just so I can get into the mindset of code-breaking? I noticed that certain newspapers have puzzles that are just like the Playfair Cipher. This is something that should tilt a little more toward the fun side.
It might be against the rules to ask for specific books, if that is the case feel free to instead answer this question by recommending various types of puzzles.