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Grey Cat The Flag 2025

Writeups

About

Grey Cat The Flag is an annual CTF hosted by NUS Greyhats.

There are two categories in 2025:

  1. Local Category: NSFs / Students that are currently enrolled in an educational institute in Singapore (team should consist of at least one Singapore Citizen), Singapore Citizens studying in an overseas institution

  2. Open Category: All participants who do not qualify for the local category / Participants who are eligible for the local category but opts in for the open category

There will be an onsite finals for the top 20 teams in the local category. Each team may send up to 4 people for the onsite finals.

Timeline

dates events
31 May, 8pm to 1 June, 8pm (GMT+8) Qualifiers, Online
28 June, 10am to 29 June, 10am (GMT+8) Finals @ NUS COM1
5 July, 9am to 5.30pm (GMT+8) GreyCTF Summit @ NUS COM1

Prizes

Open Category Local Category
RankingPrize
1st placeSGD 2000
2nd placeSGD 1000
3rd placeSGD 500
RankingPrize
1st placeSGD 6000
2nd placeSGD 4000
3rd placeSGD 2500
4th placeSGD 1500
5th placeSGD 1000
6th–10th placeSGD 500
Special PrizesStay Tuned!

Stats

Team Placing Challenges Solved
Qualifiers
CategoryPosition
Global24 / 776
Local10 / 246
No.CategoryChallenge
1EzpzBaby Bytes
2EzpzOops
3MiscCountle Training Centre
4OsintLike Comment Subscribe
Finals
CategoryPosition
Local16 / 20
No.CategoryChallenge
1MiscAuthlab
2WebA4 Toilet Paper

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Profile

greyctf_profile