Catjam 2026 - itch.ioSkip to main contentitch.io<br>Browse GamesGame JamsUpload GameDeveloper LogsCommunity<br>Log inRegister

Indie game storeFree gamesFun gamesHorror games<br>Game developmentAssetsComics<br>SalesBundles<br>Jobs<br>TagsGame Engines

Catjam 2026<br>Hosted by andsfw · #catjam2026

16<br>Joined

OverviewCommunity2

Submissions open from 2026-07-04 04:00:00 to 2026-09-08 16:00:00<br>Starts in<br>years

months

days

hours

minutes

seconds

Join jam

Make a game (or toy or a zine!? oh my!) with a catlang (concatenative language) or includes a catlang in some way. Doesn't have to be purrfect, doesn't have to be good, just has to exist. Make it with console output. Make it with graphics. Make it with audio if you're feeling bold! Experiment and have fun.

If you need a theme, uuuhhhhhh, hats! Optional, but may that provide some kind of inspiration if needed.

What's a Catlang?

A concatenative programming language is a point-free computer programming language in which all expressions are functions, and the concatenation of expressions denotes function composition. Concatenative programming replaces function application, which is common in other programming styles, with function composition as the default way to build subroutines. Concatenative Languages Wiki: https://concatenative.org/wiki/view/Front%20Page Join us on discord: https://discord.gg/Rbre4uHCt5

Rules

No Generative AI : doesn't matter if it's a big name SaaS or a local model. All work done by you (or your team) on your submissions (gamedev, artdev, langdev , etc.) should be made without any AI assistance.If your question about this rule starts with "can I use a [LLM | generative AI model] for...", the answer is "NO". This rule operates in good faith, do not squander it by lying to our face.<br>Also, if you've built a catlang before the jam, this rule applies to its development history. If your catlang was developed with AI assistance of any kind, you will have to make a new one or use someone else's. This includes promotional art and branding for the project. You can, however, remove those and replace it with something you made.<br>Vibecoded catlangs are preemptively excluded. One such example is Slap.

Readymade human-made assets are allowed to be used. Feel free to remix things from Freesound, Wikimedia, the Smithsonian Open Access collection, or other hubs of creative commons and public domain assets. Collage is an art! Have fun with it. Just don't forget to credits your sources and follow whatever terms such as CC-BY-SA.<br>Some prior work on the game itself is also allowed. Framework, engine building, designing, mockups, etc.. You may even dig up some old abandon project. Just don't submit something already finished or nearly done. Again, good faith.<br>Mature anor sexual themes should be appropriately marked.