Tetris, but the blocks are ARM instructions that execute in the browser

In plain words

OFRAK Tetris is a web-based game for desktop and mobile where falling ARM assembly instructions can be modified and executed in a CPU emulator. Players arrange 32-bit instructions to manipulate a score value stored in virtual memory, earning points by executing code that increases the four-byte integer. The game combines Tetris mechanics with low-level programming, allowing players to download completed games as ELF files for further inspection. Built to showcase the OFRAK binary analysis and patching framework, it runs in the browser using a Unicorn CPU emulator.

written from the facts on this page · September 2026

From the sources

Tetris, but the blocks are assembly instructions that run on a full, in-browser CPU emulator.

This game is Tetris, but the blocks are assembly instructions that run on a full, in-browser CPU emulator. The game includes a WebAssembly-based emulator to execute CPU instructions. Please enable WebAssembly, or use a browser that supports it tofrom ofrak.com

In the maker’s words, at launch

OFRAK Tetris is a project I started at work about two weeks ago. It's a web-based game that works on desktop and mobile. I made it for my company to bring to events like DEF CON, and to promote our binary analysis and patching framework called OFRAK. In the game, 32-bit, little-endian ARM assembly instructions fall…

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