Corewar is played between two programs written in Redcode, a low-level language similar to assembly.
Players write a program to eliminate all opponents in the memory (core) of the virtual computer.
The 'sandbox' goal of Corewar is to write code that will cause your opponent code to terminate.
A set of challenges with incremental difficulty (like in all Zachlikes) is yet to be created.
This game is part of the Zachlike Jam and currently work in progress.

The above screen with the dancing letters shows a 800 cell memory (core), with 1 instruction per memory
location. The letters represent the first character of the opcode stored in that memory location
(so D=DAT, M=MOV, J=JMP, etc). The bluered color shows who 'owns' (has written) that memory cell and
the highlights show the instructions pointers for all the processes of that color.
Example warrior code
This program will overwrite every 4th memory position with a DAT instruction, potentially corrupting
& killing the other process: