Tetris by eban

s/^ #.*/OOOO#3N#TTS NS#T#S#/
s/ *##/OO #TT  N  #TT NSpN  #TT NO SS ##SNp  NpSNpS/
s/    #.*/OOO#3N3#N3#NTT#S#N S S#S#NT#TT/
s/O*/&&&/
s/O/3 N/g
s/S/# /g
s/3/TTT/g
s/T/   /g
s/p/########/g
y/N/\n/
q

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

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