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Release date TBA·9 Cell
NULLBYTE: View on SteamBuy NULLBYTE at Steam
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A puzzle about reading someone else's code and the one-byte mistake. A whole little machine on one screen: 256 cells, four registers, a stack. From "which way the stack grows" to a chain of borrowed code. You win not with the right answer, but with what the machine actually did.

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About NULLBYTE

Read the code. Find the one byte. Take over the machine.

NULLBYTE is a puzzle about reading someone else's program and the single-byte mistake that lets you bend it to your will. Everything happens on one screen you can hold in your head: a tiny machine of 256 cells, four registers and a stack, with the whole of its memory laid out in front of you. You don't touch real computers — you learn how the machine actually thinks, and then make it do what was never written in its code.

What makes it different

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The whole machine fits on one screen. 256 bytes, and you see every one of them — the code, the stack, your input, all live.
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Nothing is told, everything is shown. The listing is a disassembler of memory as it runs. Rewrite a byte and watch the instruction change; bytes that came from your input are lit up so you can follow them.
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You can't solve a level with "the right answer." There is no answer key. The only thing that counts is what the machine actually did when it ran.
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No textbook, no wall of theory. A card appears the first time a thing shows up on screen and files itself into your Journal — you learn exactly when you need it.
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From first principles to real technique. 43 puzzles across six blocks: from "what is an address" to overwriting a return address to building a chain out of borrowed pieces of code.

Its own little machine

Not real x86 — a machine small enough to understand completely. Thirteen instructions, 256 cells, a stack that grows down, byte-level permissions, and a return address that is one visible byte. You learn the ideas behind memory safety and exploitation, not a pile of opcodes.

Features

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43 hand-made levels in six blocks, each one provably solvable
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Leaderboards: the shortest payload wins — come back and shave off a byte
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A step-by-step machine you can run, rewind, and poke at
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Three-step hints when you want them, and achievements for doing without
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English and Russian, including the listings and the comments

Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.

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