CTF: Capture the Flag
Open CTF practice and rotating live Range challenges
CTF: Capture the Flag has two connected learning surfaces. Scenario training is an open, advisory skill map covering Linux fundamentals, text processing, scripting, exploitation, forensics, and analysis. Choose any available module, use opt-in guidance while a technique is new, and return to varied practice and closed-book checkpoints when you are ready to work independently.
The Range is a rotating container-backed challenge on real Linux infrastructure. Authenticated players connect from the browser to an isolated attack box, investigate the current target, submit objectives, and compare event scores. Archived challenges may return after a recency window; a rotation is not necessarily brand-new content.
Scenario training teaches and rehearses the skills. The Range tests transfer against a live target. Free-play completion and Range scores are practice records, not course completion or credentials.
What is different here
- Start without setup. Browser scenarios provide deterministic practice with a Linux-style shell, simulated services, opt-in hints, and objective-level debriefs.
- Follow recommendations without gates. The skill map makes prerequisites visible while leaving every available scenario open for exploration and review.
- Transfer deliberately. The Range runs isolated Linux containers and asks you to recover objectives from the live target rather than repeat a supplied solution.
- Know what the result means. Training progress and event scores describe practice; course completion and independent skills assessment remain separate products.
How this command behaves
- Built for a solo session
- Save and resume your game
- Track your statistics and high scores
- Runs in the browser; nothing to install
- Playable entirely from the keyboard
Start it from the prompt
Usage
ctf [savename]Aliases
None
Where it came from
Capture the Flag competitions emerged from the hacker conference scene in the 1990s. DEFCON hosted one of the first major CTF events in 1996. What started as informal challenges between friends became a global competitive scene. Today, CTF is how many professional security researchers, penetration testers, and red teamers got their start.
Keep learning
Ready when you are. The terminal will open directly into CTF: Capture the Flag.
Run $ ctf →