SIC-1

SIC-1 is a programming game built around a computer that executes just one instruction: subtract and branch if less than or equal to zero, or “subleq.” You write programs in its assembly language, finding ways to implement tasks that would be straightforward on a conventional computer.

Write and optimize programs

You learn the single-instruction assembly language, implement programs to unlock more impressive job titles and optimize your code to climb the leaderboards. The language has only one instruction to learn, but that instruction is poorly suited to writing straightforward programs, so you have to adapt your thinking to how the SIC-1 operates.