I had a similar experience with Raymond Smullyan's books, particularly The Gödelian Puzzle Book: https://www.raymondsmullyan.com/books/the-godelian-puzzle-book

I had a similar experience with Raymond Smullyan's books, particularly The Gödelian Puzzle Book: https://www.raymondsmullyan.com/books/the-godelian-puzzle-book/ https://www.raymondsmullyan.com/books/the-godelian-puzzle-bo.... Recreational math is quite underrated.