To the eyes and ears, the game of Tetris presented is a pretty good reproduction of the basic play mode of Tengen's unlicensed NES conversion (or the Atari Games arcade machine informing it), gameplay happening in a little flickering TV window actually framed by a static rec room border of an NES and VHS player hooked up to an analogue (or what we might call non-HD) television set. This backdrop is important, because players will see a great deal of it lurching and swaying sickeningly in place of rotating falling pieces.
For those who find the room's twisting too distracting ("stop the world, I want to get off!"), the game offers a new option in the Tetris world, a "night mode" plunging everything into the dark save the glowing blocks on the screen.
By simply removing the constancy of "down", one anonymous developer's proof-of-concept has taken a game so fundamentally familiar people have dreams about it and rendered it more alienating than the explicitly sadistic variant demonstrated by Bastard Tetris.