CodeCup 2023 - An online programming competition  

CodeCup 2023 - An online programming competition

Welcome to CodeCup!

We offer you a challenging programming contest. Anybody can participate; there are no age restrictions or other special requirements. The CodeCup never charges entry fees.

In 2023 the game for the contest is Entropy. We have placed a description of the rules online. You can always watch a sample game being played.


After you login in to the CodeCup system you can submit your program. You can find the submission section under "My submissions". Your submission will be tested automatically against our sample players to ensure that it follows the rules. After passing this check your program is ready to compete! Note that your program must be capable of playing both as chaos and order.

We will hold test competitions every three weeks starting Augustus 20th. In these competitions you will see how your program performs against other players. You can follow the complete games and use this information to improve your strategy.

The official Entropy competition has been played on January 21st 2023. You can go directly to the final ranking of the programs.

Testing at home - Caia

The CodeCup Team enables you to test your program at home. Our testing software is free and enables you to organize competitions at home without involvement of other people. The software to play at home is called Caia. It works in the same way as our contest software. By hosting your own local competition you can test and improve your program in a fast and easy way. Download Caia and start today!


January 21st saw the final round of this year's CodeCup competition of the game Entropy. This year, again, Tapani Utriainen won the competition with a significant distance to the number 2. We noticed that among our participants we had a top-10 of contributions that competed for the best possible Entropy player ever. We will probably never know how strong Tapani's player is compared to that of, say, 5-time world champion on his first CodeCup win.

We also always have a competition within a competition for the Dutch high school students. This year Emil Riedeman won that competition for the second and last time. He also achieved a convincing difference to the NIO number 2 with a nice high score. Emil is also congratulated! In the mean time we have prepared the twenty second CodeCup game for 2024. It again will be a different game with a different challenge. We hope to publish it somewhere in the spring and that you will like it. We hope you liked the game of this year too. Please continue to talk about Entropy in the forum.