Rules
0CTF 2025
General
0CTF 2025: Online, Jeopardy style CTF open for every team in the world.
No restriction on the number of participants of any team.
Date and Time
48 Hours: 20 December 2025, 00:00 UTC — 22 December 2025, 00:00 UTC, timeanddate
Prizes
Cash prizes for top teams:
1st: 1713 USD
2nd: 733 USD
3rd: 371 USD
All teams: enjoyment, achievement and fancy hacking skills
Score and Ranking
Each challenge contains at least one flag. Teams get scored by submitting correct flags.
Flag Format: 0ops{this_is_a_sample_flag}
The score of each challenge will be dynamically calculated according to the number of solved teams.
Final ranking is determined by the total score of each team.
In case of multiple teams with equal scores, the team that used less time on solving challenges ranks higher.
Contest rules
1. It is not allowed for teams with independent accounts to cooperate on or discuss the challenges during the contest.
2. It is not allowed to attack the contest's infrastructure. Please report to us any flaws founded in the infrastructure.
3. Top teams are required to submit or publish a detailed writeup of solved problems to claim the awards.
4. Teams breaking rules may be penalized or excluded from the contest.
5. Team 0ops reserves the right of final interpretation for the contest rules.