Fooguessr

A browser-based game where you guess the programming language of a random snippet from Github based on just 10 lines of code, inspired by GeoGuessr.

You appear to be on a small screen. It is highly recommended to play in landscape mode or on desktop. Or don't. I'm a <span>, not a cop.

Difficulty determines how many lines you get:

Easy: 15 lines
Classic: 10 lines
Hard: 7 lines

Expertise controls how many languages are allowed:

Beginner: only recognizable, distinct languages.
Intermediate: adds some ambiguous/trickier languages
Advanced: includes most popular languages (if you played before the public release, this was the only setting!)
Impossible: every 'regular' programming language, especially obscure ones not in Advanced
These Aren't Even Languages: adds several markup/syntactical languages (e.g., Makefile, LaTeX) to include single language in the game!
You may see exactly what languages are added each successive level by checking the (Choose a Language) dropdown above and selecting different expertises (automatically updates).
- Alternatively, click here for a full breakdown of the languages...

Languages were chosen on a highly selective and rigorous basis, i.e whatever languages in GitHub's Linguist system I had heard of at some point for any reason. Kindly do not ask me to include Malbolge or whatever esolang conceived by programmers from the Siberian wilderness you personally champion. (Brain▒▙█ is an exception because we <3 Brain▟▒▀).

Report bugs/feature requests/issues on Github Issues.

DEVLOG

May 30, 2025

So I didn't release publicly on May 26. This is because I spotted more bugs that needed to be fixed, I fixed them, and I merged those changelogs with the May 26 patch logs.

This update removes 2 languages (VBA, Bash) because of bugs, but includes 19 new languages, especially to the higher difficulties. Thought your life was hard enough at TAEL? Now try distinguishing between LiveScript, JavaScript, Svelte, and CoffeeScript with 10 lines to work with. Good luck!

File extension matching has also been completely reworked and revamped, hopefully reducing the amount of times where the program can't find a matching file in a repo.

May 26, 2025

After forgetting about this project for 10 days, this will be publicly released. I am working on server-side authentication with Cloudflare D1 (shoutout Cloudflare for being so cheap btw) and a TypeScript serverside worker. This will allow you to sign in, save your scores, watch a leaderboard, and maybe even... multiplayer?

No promises!

And hey, while my motivation is back, I've made some more nice changes!

List of misc. bug fixes/improvements:

'Expertise' selector to switch how many languages are available.
Reworked the 'Difficulty' selector to mesh better with the new 'Expertise' system.
30 new languages are now available (that's a lot!), for a total of 82.
- Also includes complete refactor of the select menu (it's alphabetized now!!)
Rewritten description (the text blurbs above this) to help new players.
Fixed several long-standing issues with the code snippet display window
- It was too wide for its <div>
- Its whitespace wrapping was incorrectly configured
- Inconsistently displaying on small screens
Fixed issue where language files would fail for a mysterious reason
Fixed my ▒▛░▎▍ty regex causing the censor function to fail in some circumstances
Fixed race conditions that caused search to time out
- Okay, it's not all fixed, but I've exposed some helpful logging so you'll at least know if it happens.
- Blame it on the async/awaits, not me.
/src and /lib directories are now prioritized, which should reduce breadth-search times significantly
- I have also blacklisted some paths, such as /node_modules and /dist to stop memory consumption from getting out of hand.
Added protections so that you will no longer get ""10-line snippets"" with lines of whitespace
- Specifically, empty lines now no longer count towards the line quota.
- You can still get 10 lines of comments, though. That's just how the cookie crumbles ¯\_(ツ)_/¯
Backtracking/recursive search as a failsafe for an invalid file
General cleaning up of code and UI, especially on small screens
Misc. mispellings, idiosyncrasies, and errors

Known issues:

Some languages, notably Regex and Brain▒▆▓█, often fail if selected as the mystery language.
- This is because they are either part of another file (so my extension mapping system fails), or are rarely 7-15 lines (Regexes are usually 1 line, for example).
The interface is still a little sketchy on mobile.
- Again, if you see an issue or have any suggestions, either use Github Issues or email me.
The search algorithm is still not perfect. If you need to wait for like 100 searches until it finds a good file, sorry, but it's way less than the 200+ searches it used to take in some instances.

May 15, 2025

Added a difficulty slider because my awesome beta testers found it too difficult. So did I. (I also forgot to commit these changes for a week lmao)

May 14, 2025

Made from scratch in 24 hours 6PM - 6PM. Working and finished. Would probably do pretty well at a hackathon tbh. (me when I have to make a random side project because im bored)

FooGuessr