Capture the Flag
The CTF platform for the next generation of hackers.
Real-world challenges across web, crypto, forensics, pwn, and more. Compete in live events, climb the ranks, and sharpen the skills that matter.
Built with
GitHub
Sentry
Cloudflare
Better Auth
Neon
Next.js
Vitest
VercelGitHubSentryCloudflareBetter AuthNeonNext.jsVitestVercelShape how hackers meet the world.
spnz builds real-world challenges—web exploitation, cryptography, binary pwn, and reverse engineering. We're builders, creators, and defenders from a range of disciplines, working to make sure cybersecurity training goes well for everyone. If you're drawn to hard problems with real stakes, we'd like to meet you.
Explore challengesFlags hide in plain sight.
Great hackers aren't born with the answers. They train their curiosity, sharpen their instincts, and learn to see what everyone else overlooks. Every challenge is a puzzle waiting to be solved.
For builders on the frontier.
Community-first
Learn from writeups, share your approach, and grow with a community that believes no question is too basic. Every solve is a conversation.
Track your growth
From beginner flags to elite exploits — each challenge builds progressively. Watch your rank climb as you master new domains.
Compete live
Real-time events and global leaderboards turn learning into a sport. Prove your skills under pressure and earn your spot.
Proof from the people shipping.
I used to think CTF was only for geniuses. spnz proved me wrong. The progressive difficulty, community writeups, and live events took me from a complete beginner to placing on the leaderboard in three months.
Fajar Pratama
CTF Player
What sets spnz apart is the 'why' behind every challenge. You don't just capture flags — you understand the attack vectors, the misconfigurations, the chain of exploitation. That understanding sticks with you.
Aisha Rahman
Security Analyst
I joined for the challenges. I stayed for the community. The collaborative writeups, the no-judgment discussions, the way experienced hackers help newcomers debug their exploits — it's unlike any other CTF platform I've used.
Bayu Kusuma
Open Source Contributor