No, this is explicitly incorrect. If you try to write a clone of Tetris and word gets around to Pajitnov and Henk, you'll be sued. Copyrights and trademarks protect all aspects of Tetris's design, including the dimensions of the playboard, the tetromino shapes, the next piece indicator, the fall rate and animations, and the overall look and feel of the game. (See Tetris Holdings v. Xio, YES THIS IS COPYRIGHTABLE.) The Tetris Company applied for, and vigorously defends, ALL of these copyrights and trademarks.

If you are not a licensee of Tetris Holdings, DO NOT, EVER, develop a Tetris clone. You face legal liability if you do.