I like to play CTFs from time to time. CTF (or Capture The Flag) is a common type of contest in cybersecurity, where the contestants have to find a hidden string of text (called “The Flag”) and then submit it as a proof they solved the challenge. The flag is usually obtained for instance by gaining access to a vulnerable server or decrypting some data.
You can see most of my scores on my CTFTime profile, but, at least at the time of writing, I don’t play very often. When I do, it’s usually with the Czech Cyber Team.