FREE HACKING CHALLENGES · OLYMPIAD-GRADE CTF TRAINING
Learn cybersecurity, hands-on and free
Practice real security skills through 100 hands-on labs across major cybersecurity domains, including AI breaches inspired by real-life incidents. Exploit vulnerabilities, investigate incidents, and practise in live environments.
New: finish 90% of a discipline's labs and earn a free certificate, signed with post-quantum cryptography and checkable by any employer. How it works →
YOUR PROGRESS
0 / 0
100+
Hands-on labs
10
Disciplines
5
Learning paths
Live
Container per lab
$0
Free
FEATURED LABS
Take control before time runs out.
Investigate a compromised control system, recover authority, then prove your fix inside a live simulation.
Hack the rocket to land it
Recon the exposed flight API, reclaim the control role, and bring the booster safely onto the droneship.
Open Last Uplink →
Regain control of the ship to prevent a collision
Find the unprotected maintenance interface, break the attacker’s command hold, and steer the vessel clear.
Open Dead Reckoning →
Inject your way past the flight lock
Fly a spaceplane to Mars, then beat the licence gate: SQL-inject the crew roster, crack the admin login, and lift the key that unlocks full flight.
Open Pathfinder →
Recover the Moon mission
Take the Last Window expedition past its flight lock, recover the licence, and unlock the full lunar mission.
Open Last Window →
Find the agents before the market closes
Trace an agentic intrusion across EDR records, preserve evidence, and contain the identities moving the exchange.
Open Market Blackout →
FROM THE BLOG
Guides, hints and write-ups.
BEGINNER GUIDE
How to start learning cybersecurity at 14
A free path in for teenagers and complete beginners.
BEGINNER GUIDE
What is a CTF and how do you play one?
Capture the flag explained, and how to solve your first challenge.
CAREERS
Will AI take your security job?
The skills that keep you hireable in security in the age of AI.
LEARNING PATHS
Pick a discipline. Follow the track.
Each path orders its labs from fundamentals to competition difficulty. Start anywhere — solves count everywhere.
PWN
22 labs
Binary Exploitation
Memory layout and GDB through ROP chains, canary bypasses and shellcoding.
REV
27 labs
Reverse Engineering
Anti-debug tricks, VM detection, keygens, obfuscated binaries in C, Rust and Go.
DFIR
22 labs
Forensics & Blue Team
Disk images, packet captures, memory dumps — then tune a WAF against real attacks.
CRYPTO
18 labs
Cryptography
Classic oracles to post-quantum: NTRU, LWE, SIDH and lattice attacks.
WEB
5 labs
Web Exploitation
Host header tricks, auth bypasses and request smuggling on live targets.
???
2 labs
Mystery Labs
No category. No hints. 500 points each. Attempt if you dare.
Practical targets, easy setup
Every lab spins up a live container with a real vulnerability. Click start, get an environment, and start learning.
Built to olympiad standards
Challenge design and difficulty curves calibrated for international competition prep.
Complex Ideas, Simply Explained
Many labs include a plain-language writeup of the technique.
Web
Reverse Engineering
Binary Exploitation
Cryptography
Forensics
OSINT
Blue Team
AI Security
Network
Steganography
Security Engineering