AssemblyArena
Write a tiny assembly warrior that has to outlast rivals in shared memory
AssemblyArena is a Core War-style game. You write a warrior of up to 128 bytes in a small assembly language with instructions such as MOV, ADD, XOR, CMP and conditional jumps. Two warriors are loaded into the same block of memory and take turns running, and each tries to make the other crash. A battle is a draw if neither crashes within 4,096 cycles.
Free · No login · Browser · Intermediate
About AssemblyArena
It trains low-level thinking: addressing modes, self-copying code and tight loops. It suits programmers who know a little assembly or enjoy Core War.
It runs in the browser with an editor, a debugger view of memory and a training mode against a sample warrior. Ranked mode sends your warrior to the server for Elo-rated battles against other players' warriors. No account was needed in testing.
On Breakpoint since 25 Oct 2026.
Made this game? Claim it →
Tips and discussion
No tips yet. Solved it? Share how, and wrap answers in ||spoilers||.