Any cybersecurity people in here? 1 year anniversary with boyfriend coming up. My plan was to set up a site with some kind of cybersecurity/hacking/cryptography-related puzzle for him to solve to lead him to an eventual goal. I've attempted to consult google but haven't found anything good, just basically looking for a few different basic challenge stages he could progress through much like you would in those "Capture the Flag" challenges, where one answer leads to something else etc. But made to be on a site instead of requiring any insertion of scripts.

I don't know jack shit about cybersecurity/programming/cryptography, it doesn't need to be too complicated but not easy to the point where he would be done in a minute since he knows a lot about it. I know basic CSS and HTML to set up the site. I had some ideas about trying to hide an decryption key somewhere in the sites code that he could find? Just a pointer in the right direction on what other things to do could help