Solo accounts
One account, one rank. Your solves and score history stay attached to your handle, not to a team.
Solo practice
Practice CTF challenges on your own schedule.
Always-on practice challenges
24/7
availability
Solo
accounts
Live
scoring
What you get
A focused practice environment, nothing extra.
Built for individual practice. No teams, no schedule, no surprise rule changes mid-session.
Always available
There's no event clock. Sign in whenever you have time, work through a challenge, and come back when you're ready for the next one.
Instant flag grading
Submit a flag and you'll know if it's correct immediately. Points land on your account the moment a solve is verified.
Live leaderboard
Watch your rank move as you solve. Your profile keeps a running record of attempts, solves, and score over time.
New here?
What's a CTF, in one paragraph.
A Capture The Flag is a security challenge competition. You're given problems in categories like web, cryptography, forensics, reverse engineering, and binary exploitation. Each problem hides a string called the flag, and your job is to recover it and submit it for points.
flag format
athena{example_flag_string}
This site is the practice version: same format, no scheduled event, no teams. Sign up, work through problems at your own pace, and your solves stay on your account.
How it works
Four steps, then it's just you and the challenges.
- 01
Create an account
Register with an email and a handle. That handle is what shows up on the leaderboard and on your profile.
- 02
Pick a challenge
Browse the catalog, filter by category and difficulty, read the prompt, and download any attached files.
- 03
Submit the flag
Find the hidden string, paste it into the submit box, and you'll get instant feedback on whether it's right.
- 04
Track your progress
Your dashboard shows recent solves, score progression, and which challenges are still open.
FAQ
Common questions.
Short answers to what people usually ask before signing up. If something here isn't covered, you can ask after you've signed in.
A Capture The Flag is a security challenge competition. You're given a series of problems in categories like web, cryptography, forensics, reverse engineering, and binary exploitation. Each challenge hides a string called the flag, and you submit that string to score points. This site is the practice version: same format, no event clock, no teams.
No. This instance is built for solo accounts. Every solve and every rank position belongs to one handle.
Flags follow the prefix athena{…}. Individual challenges occasionally extend or override the format, in which case the prompt will say so.
Each challenge has a point value. Submit the correct flag and the points are added to your account immediately. Wrong submissions don't deduct points, though some challenges add a short cooldown after repeated wrong attempts.
Yes. Email verification is required before your first sign-in. Check your inbox for the verification link after registering.
Yes. There's no schedule and no countdown. The only exceptions are short maintenance windows or challenge-set rotations, which are announced in advance.