One note with this one - I got this customized as a gift for my wife, so included in the final compartment (along with the normal end 'prize') is a small engraved plastic note that says "Look under the couch cushions." I had hid a gift for her there. Everything else is standard.
Contains a story-driven puzzle, hidden compartments, ciphers and riddles, and more.
Over 40 sequences needed to solve. Rated at around 9/10 in difficulty and got great reviews from Mr Puzzle and Chris Ramsey on Youtube.
Let me know if you have any questions!
https://archimaze-puzzle.com/products/chess-castle