🛡️
Cybersecurity, from zero
Networks, ethical hacking, defense, mobile and app security, privacy, social engineering, cryptography, OSINT, cloud and careers. Every idea ends with a question.
● Learn by doing, not by reading
Learn cybersecurity and code, hands on.
Interactive lessons, a real C code editor in your pocket, a 3D trail of security houses, and step-by-step help to protect the phone you are holding. Free to start, made to be finished.
No trackers on this website
Your code runs offline, on your phone
4 languages
LESSON · IDEA 2 OF 5
Binary search: cut it in half
Each look throws away half of what is left.
Quick check
Why must the list be sorted?
Otherwise the middle says nothing ✓
Sorted lists use less memory
It only works on numbers
PRACTICE · CODE
Your first function
#include <stdio.h>
int biggest(int a, int b) {
if (a > b) return a;
return b;
}
✓ biggest(3, 7) → 7
✓ biggest(10, -2) → 10
🎉 Every check passes. Solved!
ACTIONS · CYBER TRAIL
House 3 · Password Forge
Done houses glow green, the next one amber. Walk the road, one house at a time.
PROTECT MY PHONE FOR REAL
Lock Screen House
Screen lock is on
Security update is 5 months old
USB debugging is off
The app only reads these settings and opens the right page. It never changes anything by itself.
Lessons with a question on every idea
Everything to go from curious to capable
Short lessons, real practice and instant feedback, built on what learning research says works: try first, recall often, review a few days later.
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Algorithms in C, with an editor
Loops, searching, sorting, Big-O, recursion and hashing, written in C. Type your code, press Run, see every check explained in plain words, fix it and run again.
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The Cyber Trail, in 3D
Sixteen houses along one road: screen lock, updates, passwords, phishing, Wi-Fi, malware and more. Games, an exam, and a coach in each house.
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Protect your real phone
Next to each house's offline practice, real steps on your own phone, with checks it can read and buttons straight to the right settings page.
⌨️
A terminal course
Nine units in three levels: find your way, read logs, permissions, processes, networks, hashes, users, then hunt a cryptominer and clean up.
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The live threat browser
This week's vulnerabilities and security news from trusted sources, with short summaries and a link from each story to the lesson that explains it.
How it works
Fifteen minutes a day is enough. Your streak and a daily review keep it going.
Learn an idea
A short card, a diagram or a game: put the steps in order, run a sort, trace code by hand.
Practise it
Answer, write code, type terminal commands, or play a house's task. Mistakes are explained, never punished.
Apply it for real
Use what you learnt on your own phone and accounts, then come back for the review a few days later.
Fair by design
Learn and earn, without gambling
Coins come from learning: right answers, finished lessons, solved code. A wrong answer never costs you a coin, paid packs always say exactly what is inside, and the free plan gets you through most of the app. Plans add every house, more AI help and no ads.
Your data, kept small
- Use the app as a guest, with no account at all
- Your code, progress and phone checks stay on your phone
- The AI is used only after you say yes, and you can say no
- Delete your account and its data from inside the app
Questions people ask
Is it really free?
Yes. Most lessons, the first eight houses, the terminal course and the code editor are free. The Elite plan unlocks the other houses, more AI help and removes ads.
Do I need to know anything first?
No. The lessons start from zero, and the Algorithms module teaches C from the first line.
Does it teach hacking?
It teaches how attacks work so you can defend against them, always with permission and the law in mind. Practice happens in safe simulations, never on real systems.
Google Play or APK?
Google Play is the easiest and updates by itself. The APK is the same app for people without Google Play; check its fingerprint on the download page before installing.
Start your first lesson today
Join the community on Discord to ask questions, share your streak and suggest the next lesson.