Free
$0no card needed
Everything you need to start from zero.
- All 10 modules of the Fundamentals path
- Guided terminal and lab with real Linux
- Weekly challenge, leagues and leaderboard
- Ranks, achievements and certificates
Layer 00 · Surface
Learn cybersecurity by playing.
Missions, ranks, leagues and a real terminal. Start from zero, no experience needed. Dig down layer by layer until you reach root.
Free · no card needed · works in any browser
Layer 01 · The path
From zero to your first CTF in 10 modules.
One step-by-step path for true beginners: first you learn how a computer works; by the end you’re capturing your own flags.
- 00Orientation: your first step into cybersecurityFREE
- 01How a computer worksFREE
- 02Linux FundamentalsFREE
- 03Networks: how data travelsFREE
- 04Inside Windows: the office computerFREE
- 05The web: what happens behind every clickFREE
- 06Programming: make the computer work for youFREE
- 07Cryptography: secrets, fingerprints, and keysFREE
- 08Security fundamentals: risk, defense, and responseFREE
- 09Your first CTF: put everything you know to the testFREE
Layer 02 · Missions
Every lesson is a mission.
Read a little, practice a lot. Every concept comes with an illustration or animation, plus a terminal to try it out right away.
- >_Guided terminal in your browserNothing to install, nothing to break.
- #Lab with real LinuxWhen you need it, a real machine all to yourself.
- XPQuizzes that pay offEvery mission you clear earns you XP and points.
Layer 03 · Inside
Here’s what it looks like inside.
No endless videos or PDFs. A platform built so you make a little progress every day and don’t want to stop.
Your home base
Your current mission, rank, streak and what’s next, always in view.
Illustrated lessons
Every concept with its own drawing or animation, and characters who guide you along.
Quizzes with first blood
Hints, XP for every question and a prize if you’re the first to solve it.
Rank up
Every new rank comes with its own 3D celebration.
Weekly leagues
Move up, drop down, climb back. There’s always something at stake.
Layer 04 · Ranks
Every mission helps you rank up.
Earn XP with lessons, missions and quizzes. Four ranks, four levels each, and a celebration every time you level up.
Script Kiddie
IIIIIIIV
Your first commands. Everyone starts here.
Packet Sniffer
IIIIIIIV
Now you can see what travels across the network.
Exploit Dev
IIIIIIIV
You understand how things break.
Root
IIIIIIIV
Total control of the system. Very few make it.
Layer 05 · Competition
Compete every week.
Weekly leagues with people at your level: the top players move up and the bottom ones drop down. Plus a new challenge every week in a real terminal: solve it first and you claim first blood.
Bronze
The starter league. Everyone begins here.
Silver
The week’s top players move up; the bottom ones drop down.
Gold
This is where the wings appear.
Platinum
Full wings. Real consistency.
Diamond
Pure crystal. Almost no one gets here.
Root
The top of the week. Only the best.
FIRST BLOODWeekly challengeLeaderboardCertificates
Layer 06 · Challenge 00
Capture your first flag.
A real challenge, tutorial edition. You get a terminal: find the hidden flag and submit it. Takes less than a minute.
challenge-00tutorial level00:00
Look aroundRead the flagSubmit it
Stuck?
Layer 07 · Plans
Start for free. Stay because you’re hooked.
The entire Fundamentals path is free. Premium adds advanced paths for when you want to specialize.
Premium
—
For when you want to go beyond the fundamentals.
- Role paths: pentest, defense, web and cloud
- Advanced modules
- Everything in the Free plan
Layer 08 · Root
You hit bottom. Now the real thing begins.
Create your account, choose your handle and jump into your first mission in under two minutes.