The inspiration for this project goes back to 2011, after years of playing CTFs and learning security the long way: through curiosity, late nights, broken shells, half-understood writeups, and the stubborn joy of solving one more puzzle. One of the first places I played was EnigmaGroup, a CTF site that is dead now, but still part of the path that brought me here.
There was a time when I did not have money for formal security training. I was self-taught, trying to learn from whatever I could reach. Some of that early path was imperfect. At one point, that even meant training videos and pdfs passed around through torrents, which is not something I would defend today. I kept trying to turn that knowledge into practice on CTF platforms. Those platforms gave me something cleaner and better: a legal, hands-on place to struggle, test ideas, fail safely, and slowly get better.
This atlas is also for the older names. Some platforms are active, some are retired, and some may no longer work the way they once did. I still want them here. They were part of the map. They helped people who were learning without a classroom, without a budget, and sometimes without anyone nearby who understood what they were trying to become.
Along the way, strangers on these platforms helped me. A hint in a forum, a nudge in chat, a writeup shared with care, or someone simply saying, "try again, you are close" could change the entire night. CTFs were never just security exercises to me. They were puzzles, games, tiny mysteries, and sometimes a quiet proof that I could learn something difficult if I stayed with it.
CTF Atlas is my way of saying thank you: to the builders, the maintainers, the retired projects, and the unknown people who helped make this path feel possible.