https://www.lisperati.com/casting.html

A tongue-in-cheek – but still excellent – comicbook-style introduction to Lisp programming. (There’s also a version specifically for Emacs Lisp.) It’s structured around building an adventure-style game, which as well as being a classic also offers lots of opportunities for exploring different data structures and algorithms: one can easily imagine expanding it to include (for example) an AI second player or autonomous non-player characters and gradually building a really complicated application from a standing start.