https://learntris.org/

I'm making a platform for programming challenges, and this is one where a Tetris clone.

To use the test server and get the full experience, you need to sign in with a google account, but if you want to try it the "old" way, there's a console-based version here:

https://github.com/tangentcode/learntris

Please let me know what you think, even if it's just feedback about the website/concept. Thanks!