Tetris specifically cannot be called Tetris or use the original shapes verbatim or it’s up for legal action.

I made a Tetris clone and then researched this. Soiadded a Q shape and AFAI can tell that makes mine a little safe

Yeah, I can believe that. I imagine the Tetris Holdings Company (or whatever it’s called) is pretty litigious about its trademark.

The history of Tetris in general, especially as it relates to copyright law and the weird, insanely complicated licensing situation with Henk Rogers, The Tetris Company, the Russian goverment, and the creator Alexey Pajitnov is actually pretty fascinating as well.