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Re:Game of Life, Simulated in the Game of Life (2012) [video] by Arcorann on Monday April 13, 2020 @08:32PM (#22861690)
https://news.ycombinator.com/item?id=15246348

First hit when searching for Tetris.

Re:Game of Life, Simulated in the Game of Life (2012) [video] by segfaultbuserr on Monday April 13, 2020 @08:50PM (#22861770)
Thanks for the link. It turns out to be better than I expected!