SIC-1

SIC-1

Anti-Pattern Games · 2022 · Programming, Puzzle, Simulation, Minimalist, Logic

PC
This game is free to play. Get it on Steam →

Screenshots

About SIC-1

SIC-1 is a programming game where the computer only understands a single instruction.
  • Learn an esoteric assembly language.
  • Implement programs to unlock more impressive job titles.
  • Optimize your programs to climb the leaderboards.
  • Sacrifice your personal life for the good of the company!

It's an assembly language zachlike for everyone! New programmers will appreciate how few unique instructions there are to learn (just one!), and experienced programmers will appreciate how poorly suited this one instruction is for writing straight-forward programs.

If you're ready for a challenge, respond to this job posting from SIC Systems:

SIC Systems is hiring engineers to produce highly efficient programs for our flagship product: the Single Instruction Computer Mark 1 (SIC-1).

The SIC-1 represents a transformational change in computing, reducing complexity to the point that the processor only executes a single instruction: subtract and branch if less than or equal to zero ("subleq").

Enter the brave new world of single-instruction computing and invent new ways of implementing programs that would be trivial on a conventional computer. Don't adjust the technology to match how you think, adjust your thinking to match how the SIC-1 operates!

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

Recommended Nov 7, 2025
It's a Zachlike. It's a definite "If you like this sort of thing,, then..." game, where you write programs for a fictional processor that only has a single instruction. It's got a pretty good backstory too -- and, most importantly, there's a frustrating minigame to help distract you.
2 found this helpful
Not recommended May 15, 2026
Well, it’s free so might as well try it yourself, but to me writing every program with subleq (subtract and branch if less than or equal) doesn’t seem that interesting and there are other things I’d rather be doing. subleq is kind of like the nand gate of assembly instructions and just because you can do anything with it doesn’t mean you want to have to do everything that way.
1 found this helpful
Recommended Jun 30, 2026
Absolutely brain-bending to start with, it's a really interesting challenge to figure out how to do simple things with such an esoteric instruction. It get kind of tedious later on though when the puzzles get more complicated and you have to keep reimplementing the basics in order to use them in your later solutions.
Recommended Apr 11, 2026
It's very fun game and I'm sure it's worth to play
Recommended Jan 17, 2026
flex that muscle
Recommended Dec 7, 2025
Very fun.

Community reviews

0 reviews

Sign in to write a review.

No reviews yet. Be the first to review this game.

More like SIC-1