Tetris by %20

1h
1,4s/#/ /gp
x
/^ #/{x
11q
p
d}
/#$/{x
4d
7d
8s/ $/#/
9!p
d}
x
4,5d
13,$s/ /#/4
14d

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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