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


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.


Forgotten Lore II has been published, a hybrid DJN bomber / scanning vampire. FL2b holds the record for the longest surviving vampire.


The Medium Process Hill has opened on SAL with MAXPROCESSES==64 and offers the chance to explore the space between LP and 94nop.

Access the Old Site

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.