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


corewar.io is a new web based Redcode editor and MARS from Doug McDonald and Gareth the Geek.

Access the Old Site

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

The Core War Imp Ring

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.

Previous tournaments