BOX-256
Write tiny assembly programs that draw target images
BOX-256 is a tiny fantasy computer with 256 bytes of memory and a 16x16 screen with 16 colors. Each level shows a target image. You write assembly code that draws the same picture, and when your output matches the target, you pass.
Free · No login · Browser · Intermediate
About BOX-256
The real challenge is optimization. You try to use as few CPU cycles or lines of code as possible, with tricks like multithreading. It suits players who enjoy assembly puzzles like TIS-100.
You can play free in the browser, and a Windows download is also offered. The manual explains the fixed-width instruction set. You can share levels by link, and the official leaderboard is a thread on Reddit.
On Breakpoint since 23 Oct 2026.