HEX ADVENT 2025: Crack the Advent, Conquer the Threat 🐛
WELCOME TO HEX ADVENT 2025, ‘tis the season to Unwrap Your Potential! 🎁
HEX ADVENT 2025 is a Christmas-themed CTF Advent Calendar, designed for women, by women.
What to Expect
- 12 Days, 12 Challenges: A structured schedule to build mastery across different CTF categories.
- Focus Areas:
- Pwn (Binary Exploitation)
- Cryptography
- Reverse Engineering
- Forensics
- OSINT
- Web Exploitation
- Our Mission: To empower women in cybersecurity, create visible role models, and cultivate a robust local talent pool.
| Date | What To Expect? |
|---|---|
| 1 to 12 Dec 2025 | New challenges unlocked at 09:00 SGT daily |
| 1 to 31 Dec 2025 | Challenges open until 31 Dec 2025, 23:59 SGT |
✍🏻➡️ REGISTER TO PLAY NOW
✅➡️ Fill in this Google Form to confirm your eligibility
Event Information & Rules
Please refer to this blog post for the full Event Information and Rules.
Prize Haul
A challenge is considered solved when the correct flag is submitted on CTFd before the final deadline: 31 December 2025, 23:59 SGT.
💰 Cumulative & Shared Prize Pools
| Challenges Solved | Prize Pool |
|---|---|
| 10 | S$400 |
| 11 | S$700 |
| 12 | S$1000 |
The cash prizes are cumulative, and shared equally among all eligible players at each tier.
Example: Players solving 12 challenges stand to receive a share of the S$400, S$700, and S$1000 pools.
Note: If you solve 10/11/12 challenges in total, the write-ups for three specific challenges are mandatory to verify your eligibility for the prize pools.
🎁 Exclusive Swags
| Challenges Solved | Swag |
|---|---|
| ≥ 1 | Exclusive Event T-shirt |
| ≥ 6 | T-shirt, Pin, Key Chain |
| ≥ 10 | All Swags + A share of the three cash prize pools |
Swags are awarded to individuals, and are not shared.
To receive the T-shirt in your preferred size, register on CTFd, and confirm your eligibility by 15 December 2025.
✍🏻 Best Write-Up Prize
We are awarding 3 prizes of S$100 each for the Best Write-Up submissions. Level up your explanation and documentation skills by submitting a write-up for the hard pwn, crypto, and reverse engineering challenges!
📋 Write-Up Submission Rules
Write-ups are generally optional, but they are required for prize eligibility in two cases:
- Best Write-Up Prize (Optional): You may optionally submit a write-up for this challenge to compete for the S$100 Best Write-Up Prize.
- For Top Solvers (Mandatory): If you solve 10/11/12 challenges in total, the write-ups for three specific challenges are mandatory to verify your eligibility for the prize pools.
Winning entries will be featured and published on our social media platforms.
📦 Prize Collection
Winners will be notified in January-2026 with the collection details.
❓ Frequently Asked Questions
View our FAQs here
Credits:
- Challenge Authors: Ada Lum, Ariana Goh, Cherie-Anne Lee, Verity Lim, Wu Yuewei, Yvonne Chua
- Poster Designer: Sarah Tan
- Organising Team: Alicia Ho, Carol Ng, Frances Loy, Joel Wong, Lauren Chua, Sarah Tan