Learn security by breaking things that are meant to be broken.
138 hands-on challenges across 12 categories, guided tracks for beginners, seasons and a live scoreboard for the competitive. Free to start, nothing to install.
Everything you need to go from curious to dangerous.
Not a course with videos. Real targets, real flags, and a platform that tracks how you're improving.
138 challenges, 12 categories
Web, Mobile, Cloud, web3, network, Pwn, Crypto, Misc and more. Difficulty runs from Easy to Insane (21 Insane, if you dare), with optional hints when you're stuck. Every flag looks like aSEC{…}.
Browse challengesRanks that mean something
Climb from Noob to Omniscient based on how much of the platform you've actually owned — the same rank system the pros use.
Seasons & live scoreboard
Time-boxed seasons where everyone starts at zero, plus all-time rankings for players, teams and countries. First blood on a challenge is forever.
Open the scoreboard29 badges to earn
Streaks, first bloods, category mastery, night-owl solves and a few secret ones. Your profile shows them off, with how rare each one is.
Writeups the moment you solve
Capture the flag and the community's writeups unlock for you instantly — compare approaches without spoiling it for anyone else. Write your own and earn badges.
Teams & countries
Play solo, or form a team with an invite code and climb together. Country rankings show where the strongest players are coming from.
Find a teamChallenge of the day
Today it's AES-ECB Hardcoded Key (Mobile). Solve it before midnight UTC for +25 bonus points. A new one every day.
How it works
Three steps. The first one takes a minute.
Create a free account
Username, email, password. Verify your email and you're in — no card, no download.
Pick a track or a challenge
Filter by category and difficulty, read the description, download the files if there are any. Hints are there if you need them.
Capture flags, climb the ranks
Submit the flag, earn the points, watch your rank and badges update live. Share writeups and certificates when you're proud of a solve.
Happening now
Scoreboard
Go Pro when you're ready for more.
Premium challenges, closer to real engagements, plus the Pro badge and priority support. Pay with PayPal or UPI; cancel by simply not renewing.
Your first flag is one of 138 challenges away.
Join 72 players already competing on Asecurity CTF. Free account, no card.
Create a free account