A while back I read that the Tetris Company were going after all Tetris clones, claiming to have a copyright on "the look and feel" of Tetris.
I just looked it up, and several articles turned up in the search. I nabbed up the link for the first name I recognized - <a href="http://slashdot.org/articles/99/02/19/0827245.shtml">Slashdot</a> It's back from 1999 - I have no clue if they are still rigorously pursuing game authors.
I'm not really sure what the story is with Edtris, Cubis, or Tetris26. I just supposed that the Tetris Company must have gotten after the authors, since I haven't seen any of these games for sale since Hozer days.
BTW, I would also think any Nintendo trademarks would be taboo as well.
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Goodluck with that deal. There must be 7,498 Tetris clones minimum. Tee hee.