Cloudflight Coding Contest

What?

The CCC (short for Cloudflight Coding Contest) is one of the biggest competitions of its kind. Each Spring and Autumn over 4,000 coders from all around the world simultaneously compete against each other in level-based coding games. With each level the difficulty increases and the candidate (or team) reaching the highest level within the shortest time wins. Speaking about the games, don’t miss to try out previous games on the CatCoder platform.

The topic of each game remains secret until the event. However, we might share a few hints and teasers in our newsletter and via our social media channels. 😉

For more information, and to get a feel for the contest watch our "CCC How it works" video.

When?

14 November 2025

#school

8.00h UTC (*)

#classic

13.00h UTC (*)

(*) Please carefully check for your local time!

Team or single?

#team

You rather join forces to tackle a challenge? No problem. Team up in groups of 2-3 (#classic) or 2-5 (#school). During the contest each team member is able to submit answers. Setting up a team is either done while registering for an event location or anytime after.

#single

Are you a master on your own? Very well! Register for an event location, and you are all set. Don't forget, you can still challenge your friends to take part without having to work with them ;)

Contest types

#classic

4 hours
For all skill levels
Max. team size: 3 people

The best way to prepare for the contest is to try out one of our numerous games on our game platform, CatCoder

Note that only a few participants are able to accomplish all levels. There is no need to feel discouraged if you don't get that far - this is normal and intended.

#school

2 hours
For pupils only (from 16 years old, except for Austria from 14 years)
Max. team size: 5 people

Test and develop your coding skills with our school game! Do you feel confident? Then stay around and join the Classic CCC in the afternoon!

In Austria School CCC is even recommended by the ministry of education. How does that sound? - A coding contest instead of just another lesson, let your teachers know!

Ready?

Register on-site in a nearby city (see all locations here) or online (The Web)
Choose your team (see special requirements for #classic and #school) or join individually
Try training games on the CatCoder talented people
Stay up to date via email and our social networks (we tend to share some hints 😉) suitable internships

Rules of the Game

Upload your solution(s) to CatCoder for each level
Wrong solution = 1 penalty minute
Submission of source code after level completion = 2 bonus minutes
If you participate on-site, you are not allowed to download excessively and/or stream
Team rules: each team member is allowed to bring a laptop and each team member can submit the team’s solution

Event Agenda

Some parts might differ depending on the contest location you are participating at. Check your email before the event for more information.

Pack your laptop and charger.
Arrive at your contest location at least 30-45 min prior to the contest.
If you haven’t registered yet, make sure you do it asap.
Set up access to the local network.
Join us at discord and send a "hello world" message to the lobby.
Start of the CCC game: You will be coding for 4 (#classic) or 2 hours (#school).
Networking & buffet (depending the location)
Score summary and presentation ceremony.

Still have questions?

Get in touch with us:
team@codingcontest.org