CTF Arena
Capture The Flag contests: hack the practice targets, find the hidden flag and submit it for points.
Join solo or with a team.
Solve the challenge on its target.
Paste the flag, earn points, climb the board.
Showing 33 CTFS in this order: featured, live now, upcoming (soonest first), then finished. Ours and other organisers' CTFs are listed together.
x3CTF 2026
x3CTF is a cute little jeopardy-style CTF with web, pwn, rev, crypto, and misc challs!
- Starts
- Ends
- Dec 6, 2026 23:00
- Duration
- 2d
- Where
- Online
- Entry
- Free
- Organiser
- x3CTF
- Prizes
- TBA but they will be cute
bi0sCTF 2026
Team bi0s invites you to our prestigious bi0sCTF 2026, a premier hacking event designed for hackers of all generations. We are dedicated to crafting challenges that incor...
- Starts
- Ends
- Dec 6, 2026 22:00
- Duration
- 1d 12h
- Where
- Online
- Entry
- Free
- Organiser
- bi0s
- Prizes
- TBA
OTERIA Cyber Cup #4
# OTERIA Cyber Cup #4
- Starts
- Ends
- Dec 5, 2026 22:00
- Duration
- 8h
- Where
- France, Gennevilliers, France
- Entry
- Free
- Organiser
- OteriHack
- Prizes
- 1st place: 500€ + goodies 2nd place: 300€ + goodies 3r...
niteCTF 2026
niteCTF, hosted by Cryptonite, is designed to help students explore new & diverse areas of cybersecurity while providing a platform for experienced players to sharpen the...
- Starts
- Ends
- Dec 13, 2026 17:00
- Duration
- 2d
- Where
- Online
- Entry
- Free
- Organiser
- Cryptonite
- Prizes
- TBA
BSides Algiers 2026
BSides Algiers 2026 CTF, a jeopardy-style CTF featuring intermediate to extreme challenges on reverse-engineering, binary exploitation, cryptography, web security and mor...
- Starts
- Ends
- Dec 19, 2026 12:00
- Duration
- 1d 12h
- Where
- Online
- Entry
- Free
- Organiser
- sarrus
- Prizes
- Prizes will be announced soon.
BackdoorCTF 2026
BackdoorCTF is the flagship event of InfoSecIITR.
- Starts
- Ends
- Dec 20, 2026 17:00
- Duration
- 1d
- Where
- Online
- Entry
- Free
- Organiser
- InfoSecIITR
- Prizes
- The prize pool for BackdoorCTF 2026 will be announced soon....
ASIS CTF Finals 2026
ASIS CTF Finals 2026
- Starts
- Ends
- Dec 28, 2026 19:00
- Duration
- 1d
- Where
- Online
- Entry
- Free
- Organiser
- ASIS
- Prizes
- .:: TBA ::.
GaianSpace Perihelion CTF 2027
GaianSpace CTF, hosted by GaianSpace!
- Starts
- Ends
- Jan 3, 2027 23:00
- Duration
- 1d
- Where
- Online
- Entry
- Free
- Organiser
- GaianSpace
- Prizes
- The top three teams and the best write-up will receive the f...
The Cyber Hackathon 2026 (CTF) — PKCERT × DigiInn360 × NUST
Online intensive CTF with mixed Red and Blue Team challenges, open to teams within Pakistan.
- Starts
- Ends
- Aug 18, 2026 22:00
- Duration
- 12h
- Where
- Online
- Entry
- 1,500.00 PKR
- Organiser
- PKCERT, DigiInn360, NUST
- Prizes
- PKR 275,000 pool (150,000 / 75,000 / 50,000) + certification...
All challenges (17)
Every published challenge on the platform. Open one to read the brief; register to submit flags.