Reconnaissance
Map fictional networks, enumerate services, and turn noise into a lead.
nmap / dig / whoisSYSTEM ONLINE / PUBLIC BETA
The internet is a puzzle. Start solving.
HackerOS is a browser-based cybersecurity simulation game built around investigation, command-line thinking, and missions that remember what you do.
34 launch missions
12 simulated tool families
0 real-world targets
operator@hackeros:~$ nmap -sV shadow-api.test
Starting simulated Nmap scan...
443/tcp open https shadow-api
8080/tcp open http relay-console
2 services found. Evidence added to case file.
operator@hackeros:~$
Learn by doing
Think like an investigator
Build your reputation
THE MISSION BOARD
Every clue is a command away.
Start with a terminal, a vague brief, and a target that does not want to be found. Work through evidence, unlock better tools, and make the call when the flag is yours.
Exploit the story
Follow clues across web apps, APIs, files, crypto, and human mistakes.
curl / sqlmap / stringsLeave a trace
Earn XP, unlock tools, join operations, and climb the weekly leaderboard.
XP / ranks / co-opYOUR FIRST SHIFT
A safe place to get dangerous ideas.
HackerOS feels like a Unix desktop, but every target is fictional and every tool is simulated. You can practice the habits of security work without touching a real system.
Open the desktop- 01
Pick a case
Briefings give you the context. The mission gives you the constraints.
- 02
Work the terminal
Use realistic command patterns, local manuals, and recovered evidence.
- 03
Submit the flag
Prove the finding, collect the reward, and unlock the next layer.
READY WHEN YOU ARE
Your first target is waiting.
Enter HackerOSFree to play. Fictional targets. No attack traffic.