It's almost New Year's and here's an original way to show the countdown using Tetris. I'm sure something similar has been done before, but I had a lot of fun building this (TDD style) using Claude Code.

After New Year's it can also function as a regular clock:

https://tetris-time.koenvangilst.nl/

For the impatient, it's possible to increase the speed using url parameters:

https://tetris-time.koenvangilst.nl/?to=2025-12-31T23:00:00....