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 Core War Tiny Stone Challenge has just been announced and offers the chance to fine-tune your stone, stone/imp and bombing skills.


The first issue of CoreOps has been published. This issue investigates Agony- & Ecstasy-style scanners, featuring Excalibur and Kusanagi.


The Valentine Tournament is over. First place was taken by Basilisk B 8, closely followed by Monolith, Zygote and Scorpion.

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.

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