https://www.techdirt.com/articles/20210128/10553346143/crunch-is-join-our-public-domain-game-jam-whip-up-entry-this-weekend.shtml

Game jams come in all shapes, sizes and, crucially, time spans. Many of them take place over a single weekend — so even though it's been running since the start of January, there's still time to sign up for our public domain game jam, Gaming Like It's 1925 and start working on an entry before the deadline on Sunday night!

We're seeking analog and digital games that make use of material published in 1925, which entered the public domain in the US this year. Sometimes the best games are the simplest ones with the clearest focus, and that's where a three-day crunch can be a help rather than a hindrance! By making use of tools like Twine or Story Synth, even if you've never used them before, making a digital game is easier than you think. Or, you could try thinking up a roleplaying or party game that needs nothing more than some written rules. Check out the game jam page for the full rules and some links to public domain works you could draw on, then join the jam and get designing!