What is Core War?

Core War is a game played between two or more program 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 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.


First place in the Halloween Tournament was claimed by Core of Duty with an impressive 45 point lead.

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.