Flash CTF challenges – you know ’em, you love ’em (we hope)! Since January 2024, we have hosted monthly Flash CTF challenges. These fast-paced, bite-sized competitions are a way that we can give back to the cybersecurity community, offering free opportunities for learners of all levels to sharpen their cyber skills.
Whether you’re getting started or a CTF pro, these Flash CTFs are a super fun way to get hands-on learning and win prizes. Since we began the Flash CTFs, we have gotten awesome feedback from all of you and always have smiles on our faces when we hear you loved a challenge! We know some of them drive you crazy – but let’s be honest, that’s a little fun too đ
We’re so grateful to everyone who joins in to make these competitions so exciting. The Flash CTF series has always been about accessibility and community impactâremoving barriers to entry and encouraging the next wave of security talent. This milestone is as much yours as it is ours.
If you follow us on LinkedIn, you may know that with the completion of our August 2025 Flash CTF, we have officially surpassed 100 Flash CTF Challenges!
The “Top 100” (For Fun)!
To celebrate this milestone, we asked our team to look back and rank the Top 100 Flash CTF Challenges. This list is entirely subjectiveâ no âright answersââjust our take, and itâs wide open for friendly debate
- Syscall Me Maybe – March 2025
- Christmas Trees – December 2024
- Microdosing – July 2025
- Conversion Perversion – May 2024
- Spreadsheet – August 2025
- Armorless – July 2025
- Super Quick Logic Invitational – August 2025
- Backchimney – December 2024
- Dot-Matrix Destruction – June 2024
- Ms Blue Sky – March 2024
- Do Not Strike The Clouds – July 2024
- Berkeley Baubles – December 2024
- I Heard You Liked Loaders – January 2025
- Fishing Plan – September 2024
- Pikalang – November 2024
- Cleverly Forging Breaks – September 2024
- Hunt-and-Peck – June 2025
- Cracking The Javashop – August 2024
- Carrot – February 2025
- Tampered Seal – April 2025
- Talk To Me – November 2024
- Duality of Key – October 2024
- Email From Krampus – December 2024
- Keeper In The Net – July 2024
- My Little Pwny – October 2024
- Steg64 – November 2024
- Rainbow Box – August 2025
- Whisper Of The Pain – January 2025
- ShaNOISEmir – June 2025
- Go Vote! – August 2024
- Archify – March 2025
- runCAPTCHA- October 2024
- CVExec – April 2025
- Till Delete Do Us Part – February 2025
- Grinch’s Cryptological Defense – December 2024
- On the Grid – August 2025
- Faulty Curves – June 2024
- 007: License to Scan – February 2024
- Galactic Archives – May 2025
- Checking It Twice – December 2024
- FlaskForm Pharmaceuticals – March 2024
- Gretel – May 2025
- Hot Coco Cold Winter – December 2024
- Santa’s Base Converter – December 2024
- Browser, Wowser – May 2025
- Simple Sums – February 2024
- Ashhay – February 2025
- Opermutated – June 20255
- SHA256 Collider – February 2024
- Trading Places – January 2025
- Clock Out – June 2024
- Second Breakfast – July 2024
- Mimican’t – August 2024
- MetaShop – April 2025
- Open Application – October 2024
- Treasure Map – June 2025
- Collecting Seashells – March 2025
- The Seer – April 2025
- C’est La V(M)ie – May 2025
- Library – September 2024
- Wizard Jail – May 2024
- Loopy Primes – August 2024
- How Cool Are You? – March 2024
- Santa’s Digital Photo Gallery – December 2024
- Anonymoose – June 2024
- Login Query – April 2024
- Filesystem Folly – May 2024
- Internet Talk – April 2024
- Key For Me – September 2024
- Admin Portal – November 2024
- A Tale of Two Ciphertexts – May 2024
- Stack Smashers – September 2024
- Flag Appraisal – July 2024
- Abashed Confessions – December 2024
- Canary in the Bitcoin Mine – August 2024
- Obnoxious Offset – April 2024
- Camping Adventures – March 2024
- Obfuscated Secrets – February 2024
- Satellite Command – June 2024
- Direct Login – February 2024
- Magical Meta – July 2025
- Rear Hatch – January 2025
- Caffeine Conundrum – April 2025
- Impossible Login – May 2024
- Nothing to C Here – July 2025
- Cooked Books – January 2025
- Cookie Crackdown – February 2025
- Baby Something – August 2025
- Xylophone Network Graphics – March 2024
- Where We JMPing – June 2024
- better_eval() – February 2025
- Spider’s Curse – October 2024
- Frenzy – May 2025
- Working For Peanuts – July 2025
- Port Authority – July 2025
- Shifty XOR – March 2025
- Slithering Security – November 2024
- All About Flags – August 2025
- 26 Dimensions – March 2024
- Lost Luggage – April 2024