[gchamonlive]

These visual elements have to be protected by intellectual property somehow. Has Microsoft ever legally persecuted these types of projects before? Or projects built upon such libraries?

I'd be wary to build on top of these clones only to receive a cease and desist, but that's a fear of mine, I don't know if it's founded.

[poly2it]

It can be more difficult to claim copyright over shapes and patterns than you think.

[flykespice]

And somehow Tetris Company succeeded it..

[mschuster91]

Only for the original Tetrominos, and even there there are just so damn many Tetris clones and spin-offs... that battle is lost.

Side note: the iOS version of Tetris is an ad and gambling ridden hellscape, and that's a licensed spinoff.

[xyst]

I have a gallery of cease and desist orders. I would love to add MSFT to the list.