Build a computer from scratch: arrows, assembly, marbles, and a letter written in equations
2026-11-10 (Tue) · Covers Nov 1 → Nov 10, 2026 · 5 games
Steam's Programming tag got more than ten new games this week. Three of the ones that truly put tech into the mechanics do the same thing: build a computer from nothing, using arrows, assembly and marbles. The other two turn arithmetic into a production line, and make math the only language you share with aliens.
This column covers one kind of game
Games where real science or technology is written into the rules, so you play by understanding it. Sci-fi themes or pretty visuals alone don't count. Why
Diagram: the mechanic, drawn by us. Not a screenshot of the game.
What you do
An infinite sheet of grid paper. Each arrow you place does one thing: pass the signal one cell in the direction it points. Line up a few dozen and an AND gate lights up; keep stacking and you get adders, memory, and finally a CPU that runs Tetris. The community has already written its own assembler inside it.
The science
Digital logic and computer architecture. It splits logic gates one level further down, using the arrow's passing rule as the only building block, and stacks from NOT and AND up to a clock, RAM and an instruction set. It plays more like a cellular automaton.
Where to play
PC (Windows / SteamOS / Linux). The full Steam release was scheduled for Nov 10, 2026; at the time of writing the page showed no price. Free demo on Steam; a browser version at logic-arrows.io (whether free: to be checked). Simplified Chinese, no Traditional Chinese.
Our take
The lowest barrier to seeing how a computer computes 1+1, because there is only one rule. The road to the CPU is steep, so try the free demo first and make sure you won't quit halfway.
Diagram: the mechanic, drawn by us. Not a screenshot of the game.
What you do
On the left, a code editor with syntax highlighting and breakpoints; on the right, 16 registers and memory shown in hex, decimal and binary. You write assembly line by line, step once, and watch flags flip and memory change. Then the same instructions draw on a 320×200 screen, play 8-channel chiptune, or drive a six-axis robot arm that loads blocks onto a conveyor.
The science
A custom minimal CPU emulator (16 registers, 64 KB address space, flags). 70 tutorial missions go from bits, hex and shifts to loops and the stack, plus 100+ challenges. Mods are JSON + Lua and can go on Steam Workshop.
Where to play
PC (Steam), out Nov 5, 2026 at US$15.99, 15% off at launch until Nov 19. Simplified Chinese, no Traditional Chinese. No demo, and no player reviews yet at the time of writing.
Our take
For people who took computer organization but never got to touch a CPU; complete beginners will stall in the first few missions. There are already plenty of assembly puzzle games; this one gives you a whole machine. Pricey with no demo, so wait for the first reviews.
Diagram: the mechanic, drawn by us. Not a screenshot of the game.
What you do
Balls with numbers roll across a hex map. You lay conveyors and place pushers, lasers, magnets and rotators so two 3s collide into a 6, then line up a row of balls in the shape and values the puzzle asks for. Everything runs on its own; miss one cell and the whole line jams.
The science
Math plus automation. Machines merge, split and modify the numbers on the balls, so a formula becomes a production line. Leaderboards rank size and speed, the classic space-versus-time trade-off from algorithms class.
Where to play
PC (Windows / macOS / SteamOS / Linux, Steam), out Nov 6, 2026 at US$14.99, 10% off at launch until Nov 20, with a free demo. Simplified Chinese (voice and subtitles), no Traditional Chinese. All 23 reviews positive at the time of writing.
Our take
If you played Opus Magnum or Infinifactory, you'll be at home right away; if factory games aren't your thing it may feel like doing sums at work. The developer cites those two as inspiration; hex cells plus number balls is a variation, but a very complete one.
Diagram: the mechanic, drawn by us. Not a screenshot of the game.
What you do
Stack blocks on a grid to build a marble run, press start, and watch the marble roll through boosters, anti-gravity pads, portals and slow honey zones. Then wire up buttons and sensors so a passing marble triggers trapdoors, lights or marble spawners. The developer says you can build pinball tables and calculators without writing code.
The science
2D rigid-body physics (Box2D) plus a Minecraft-redstone-like logic system: wires, logic gates, timers and memory cells. The marble itself is the signal, so physics and logic share one map.
Where to play
PC (Windows / SteamOS / Linux, Steam), out Nov 2, 2026 at US$9.99, 25% off at launch until Nov 16. Traditional Chinese supported. There is also a free web version on itch.io with sandbox, puzzle and platformer modes (whether logic blocks are included: to be checked).
Our take
The only pick this week that has Traditional Chinese and plays straight in the browser, so the barrier is lowest. If you want to study logic circuits seriously it will feel like a toy, but for seeing a circuit move first, it is the most intuitive.
Diagram: the mechanic, drawn by us. Not a screenshot of the game.
What you do
The whole screen is alien symbols, menus and dictionary included. Each symbol has a “?” under it where you write notes, and your note appears everywhere that symbol shows up. Chapter one is all equations: you guess their number system from addition, subtraction, multiplication and division, then use what you know to unpack dictionary entries that explain alien words with more alien words. Even quitting the game has to be decoded first.
The science
Math as a shared language. Over 1,000 ideographic symbols and 20,000+ words of text build rules up from numbers and equations, later reaching ideas like gravity and electrolysis of water. The developer cites Story of Your Life and Contact as inspiration.
Where to play
PC (Steam), out Nov 1, 2026 (Nov 2 in Asia) at US$9.99, with a free demo. There is no human text in the game; you take notes in your own language, so any player can follow it. At the time of writing: 498 reviews, 93% positive, almost four times the count of a week earlier.
Our take
A must if you loved Chants of Sennaar, and it is harder and purer. No art, no music, no tutorial, so if that sounds dry, try the demo. The developer previously made A=B and Understand.
November VR releases are mostly action, shooters and party games, with no clear science mechanic.
Citizen science games
Everything we found was an existing project; nothing new launched in the last 7–10 days.
Board games
No crowdfunding campaign we could confirm with a new science mechanic.
AI-generated games
Only updates to existing platforms; no new playable game with AI as the core mechanic.
Research labs and museums
No releases in range.
Game jams
Results from Spooky Jam 2026 and iGGi Game Jam 2026 had no winner we could confirm with a science mechanic.
Near misses
A few upcoming space-factory, observation-puzzle and flowchart-robot games: their pages don't show a real science mechanic, or the science is too thin.
Know a science game we missed? Leave a note on the onholdlab homepage, or find @onholdlab on Threads and Instagram.