NULLBYTE CD Key
PC price comparison · 9 Cell · Oct 21, 2026
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.
Lowest final price
at Steam · Standard Official
Historical low: $1.99 on October 22, 2026
Get the best deal ↗Compare NULLBYTE key prices
Sorted by final price including fees, never by commission.
Key resellers are being added. Until then you’ll find the official stores here.
NULLBYTE price history
Historical lows by store
- Steam$1.99
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 The whole machine fits on one screen. 256 bytes, and you see every one of them — the code, the stack, your input, all live. 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. 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. 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. 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 43 hand-made levels in six blocks, each one provably solvable Leaderboards: the shortest payload wins — come back and shave off a byte A step-by-step machine you can run, rewind, and poke at Three-step hints when you want them, and achievements for doing without English and Russian, including the listings and the commentsRead more
NULLBYTE system requirements
Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10 (64-bit)
- Processor: Intel/AMD x86-64, dual-core 2.0 GHz
- Memory: 2048 MB RAM
- Graphics: GPU with Vulkan 1.0 support (GeForce GTX 400 series, Radeon HD 7000 series, Intel HD Graphics 500 series)
- Storage: 200 MB available space
Recommended
- Requires a 64-bit processor and operating system
- OS: Windows 11 (64-bit)
- Processor: Intel/AMD x86-64, quad-core
- Memory: 4096 MB RAM
- Graphics: Dedicated GPU with Vulkan 1.1 support
- Storage: 200 MB available space
NULLBYTE key FAQ
+What is a NULLBYTE CD key?
A NULLBYTE CD key is a digital code that unlocks the game on a PC platform such as Steam. After redeeming it, you download the game directly from that platform and it stays in your library.
+What is the cheapest price for NULLBYTE?
The cheapest NULLBYTE key right now costs $1.99 at Steam. We compare 1 offers from 1 store, and the price already includes payment and service fees.
+What is the historical low for NULLBYTE?
The lowest price we have recorded for NULLBYTE is $1.99 on October 22, 2026. Check the price history chart to decide whether to buy now or wait for the next sale.
+Is it safe to buy a NULLBYTE key?
Buying from an official store such as Steam, GOG or Epic Games is always safe. Key resellers are often cheaper but sell keys second-hand, so check the region lock and buyer protection before you buy. Every offer on GameKeyDeal is labelled as official or reseller.
