Arguably, you're not playing (or implementing) modern Tetris then, but some variation. > Modern versions of Tetris released after 2001 use a bag-style randomiz

Arguably, you're not playing (or implementing) modern Tetris then, but some variation. > Modern versions of Tetris released after 2001 use a bag-style randomizer that guarantees players will never receive more than four S or Z pieces in a row. This is one of the "Indispensable Rules" enforced by the Tetris Guideline that all officially licensed Tetris games must follow.[9] https://en.wikipedia.org/wiki/Tetris#Infinite_gameplay_impossibility https://en.wikipedia.org/wiki/Tetris#Infinite_gameplay_impos...