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.

✍🏻➡️ 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

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

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