Shenzhen I/O
Build circuits and program their chips in compact assembly
You start a job at a new employer in Shenzhen and build electronic devices. Each puzzle has you place parts such as microcontrollers, memory chips and logic gates, wire them together, and program the chips in a compact assembly language. In that language any instruction can run on a condition.
Paid · No login · Desktop · Advanced
About Shenzhen I/O
It trains low-level programming under tight limits, plus some basic circuit thinking. You learn the parts from a manual with over 30 pages of datasheets, reference guides and diagrams. It suits programmers who like reading specs and making designs smaller and cheaper.
It is a paid game from Zachtronics, released in 2016 for Windows, macOS and Linux on Steam, GOG and itch.io. It also has a sandbox mode and a solitaire card game.
On Breakpoint since 23 Oct 2026.