Mon, 06 June 2022, 12:00 UTC — Fri, 10 June 2022, 12:00 UTC 


Grey Cat The Flag event.

Format: Jeopardy Jeopardy

Official URL:

Future weight: to be determined

Rating weight: 0.00 

Event organizers 

Grey Cat The Flag is a jeopardy style CTF organized by NUS Greyhats ( and National Cybersecurity R&D Labs ( in June.

This CTF is open to all students studying in Singapore (Sec/JC/Poly/Uni) + NSFs as well as international teams.

However, only local students & NSFs can qualify for the in-person final round to get our prizes! Local teams who wish to be eligible for the finals must sign up at with a maximum team size of 3.

International or casual teams can sign up on the CTF platform directly. The link for the platform will be provided closer to the event date.

For fairness, please also play in teams of 3.

Discord Server:

Infra sponsored by

Platinum Sponsor: Cyber Security Agency of Singapore

Gold Sponsor: GuardRails


Only Singaporean students teams are eligible for prizes.

Champion $9000
2nd $6000
3rd $3000
4th-10th $450 each

Top 10 Writeups
(for specific challenges) $30 each
First Bloods
(for 10 specific challenges) $30 each

Sign in and register a team to mark your interest.

Interested teams

4 teams total

Devils king
Sign in to comment.