Please dont block, if you can stand it. We need sane people here to downvote the trolls instead.

This is a cool explanation:

https://youtu.be/MGyKQvSzdHE?si=-LV8NS0XRcJj961Q

Which game is it?

https://spliit.app/

Free, private (can be self-hosted), and open source. You don’t need to create an account to use it. If I remember correctly, this was created in response to the recent changes to Splitwise.