functional

functional

yancouto · 2021 · Simulation, Puzzle, Minimalist, Programming, Text-Based

PC
Mixed64% · 39
Best price
$6.99
lowest tracked $3.49
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Steam
Standard Edition · Steam
$6.99
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Screenshots

About functional

functional is a puzzle game about math and abstraction. Solve problems and reuse your solutions to write ever-more-complex logic.

Start from scratch



Start with the simplest mathematical primitives. Everything is a function, and functions can be used to build everything else.

Solve increasingly complex problems



Use your previous solutions as black boxes, and use them as building blocks to build more complex solutions.

Compare your solutions



Compare your solutions against other players, and against your Steam friends, both in efficiency and simplicity.

Workshop support



Create your own levels and share them with the community.

DLC & expansions

🎁 Complete the collection

Base game + 0 of 1 DLC at today's best prices (some DLC unpriced).

$6.99
to own everything

What Steam players say

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

✦ AI summary

Players appreciate this lambda calculus puzzle game as an educational and intellectually engaging experience, with some finding it a worthwhile challenge for those interested in functional programming concepts. However, the game suffers from significant accessibility and technical issues that undermine its polish: the small, hard-to-read font lacks customization options, the window doesn't fit properly on all screens with no resolution settings, and the UI could better introduce the syntax and controls to new players.

Not recommended Sep 3, 2025
I think it is a fun little reminder of lambda calculus principles. But I can't recommend it. The issue just comes down to a lack of polish I'd expect for a paid game. The most glaring issue is inaccessibility. The game has a minimalist, terminal aesthetic - that itself is fine, it fits the point of the game. But it is very hard to read the text - it has a small, blocky font that is unpleasant to look at and difficult to read for users with worse eyesight. There are no settings to customize this, no accessible mode. Font size and style should be the minimum required settings for a terminal game like this. Instead you just have a volume setting. The controls are also a bit of an issue. The game seems to use an odd mix of keyboard and mouse controls. There are some buttons that can only be clicked, like solution selection, or 'open on playground' button, but don't seem to have key controls. On the other hand, menu items aren't buttons and can't be clicked; you have to navigate using keyboard only. So you can use keyboard for most things, but not all, and still need a mouse, but you can't use a mouse everywhere you'd expect. I get it's trying to be a terminal game, but it just doesn'…
Recommended Jun 28, 2025
its fun when you solve and annoying when you don't, which is ever game that exists.
Recommended May 2, 2025
Finally got the game to run- giving a thumbs up for now.
Not recommended Mar 30, 2025
Would be great, if: - The window fit on my screen --- now it clips both above and below, and there is no way to change size/resolution - Home/End keys did work Otherwise seems nice
Recommended Dec 26, 2024
All these freakin' noobs needing a tutorial?! Bah humbug I say. Git Gud as the kids say. The interface is a little confusing at the beginning and the syntax a little restrictive, but if you follow the stages as recommended it does guide you through it. I liked this puzzle game a lot actually. It kind of reminded me of the time I tried to make a for loop in C macros. It actually feels a lot like C macro programming which I have always loved the puzzle of much to the chagrin of my coworkers or code reviewers.
Recommended May 5, 2024
Nice for learning lambda calculus, but there are a couple issues. The language's syntax isn't introduced well, every section could use more info and the UI scaling needs a rework. 100% achievement completion boils down to solving every level and interacting with the workshop. It's difficult, but not bad if you find programming interesting. Overall, OK.

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