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that's not really infinite, though, and other pages do describe it as truly infinite, e.g.:

> When a newly spawned piece falls, it never gets closer to the floor due to the nature of infinity.

i'm nitpicking, of course. everything described is possible with a sufficiently large board. you'll just have a time constraint to place each block.

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For the method described in the paper to work, the infinite version of the game requires a semihard drop operation or something analogous as a legal move. In modern versions of Tetris, the rotation systems permit very unusual operations such as wall climbing or infinite lock delays, not to mention rotating in physically impossible ways. A semihard drop is not a big ask on an infinite playfield. It's within the spirit of the game.

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