CodeCup 2024 - An online programming competition  

CodeCup 2024 - 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 2024 the game for the contest is Sudoku. 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 first and second.

We will hold test competitions every three weeks starting in August. 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 Sudoku competition has been played on January 20th 2024. 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!


The final competition was played on Saturday, January 20. Tomek Czajka won the CodeCup for the seventh time. He only participated in the last few matches and showed us that we had to take into account the strength of his player NineDigits. Congratulations Tomek. Within the CodeCup competition we had an internal competition for our Dutch students for the NIO (Dutch Informatics Olympiad). That competition was won by Jelle van der Drift. His program Sudokumax was fourteenth in the final ranking. Congratulations Jelle. In the last week of December, the CodeCup team has been working on the game of 2025 and we think we have an interesting challenge for you. We hope to publish it at the end of June, before the EGOI (European Girls Olympiad in Informatics) and the IOI (International Olympiad in Informatics).