For fans of Pico-8, it looks like the advent calendar is back again this year, with a new game each day this month. I hadn’t checked for new Pico-8 games for a week or so, but there are already 5 games available via the calendar.
Note that the 4th one isn’t playable on the GameShell directly, since it requires a mouse. But the main calendar works, and the other games are playable. (Hopefully there won’t be too many mouse-centric games.)
Here’s a link to the BBS entry, but the calendar should show up on the list in your GameShell when you run Pico-8: