What is Core War?

Core War is a game played between two or more programs written in Redcode, a low-level language similar to assembly. Players write a program to eliminate all opponents in the memory of the MARS virtual computer. Core War can also be used as a platform to experiment with genetic programming.

Latest News


The Easter Core War Tournament has just been announced. Entries will battle in a multiwarrior medium process core.


The CoreWarRITSI tournament has been announced. The tournament will be held at the VII Congreso RITSI, Universidad Autónoma de Madrid.


Parallel exMARS has just been released by Martin Ankerl, featuring multi-core evaluation of rounds.


Leeds Code Dojo will be holding a Core War event in Leeds UK next week, from 6pm on Wednesday 2nd September.

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The old site remains available while we move everything to the new layout…

Getting Started


The King of the Hill servers hold an ongoing tournament with the results available a few minutes after submission.

Christian Schmidt and John Metcalf share first place in the Tiny Stone Challenge.

Congratulations to Steve Gunnell, winner of the Valentine Core War Tournament.