Longgame Tech Innovation Jams are about promoting interesting, innovative art (especially with Lisp) and sharing it (especially open source).

The jam focus for LTIJ3 is portals. This can mean whatever you want! It's simply some inspiration. Portals in 2d are still portals!

The jam is a week long. Don't feel pressured to make something super intricate or polished; it's more about having time to craft something you find interesting.

Here is Longgame Tech's Discord server (permanent invite link): https://discord.gg/Jew7WXrAvG

This game jam is about developing fun and interesting mechanics, promoting and encouraging Lisp, and public sharing of art.

Devving with Lisp isn't required. Lisp is a fascinating mathematical macroing language.

"Open source" doesn't have to mean that anyone can use it, just that it's publicly viewable. I personally like dedications to the public domain (this means big companies can't stop small companies from using the ideas). There is the license of "you can use this art in any project for any reason, with an optional reference back to the source". An example of that is essentially 0BSD or the Unlicense.

FAQ

What is Lisp?
Lisp is an abstract language discovered at the end of the second millennium (late 1950's). It is about list processing, usually of symbolic expressions (s-exprs). It is one of the biggest languages for developing intelligent machines (AIs).

What are some games with interesting portal mechanics?
Google has interesting thoughts. Valve's Portal is important and helpful.