/usr/share/games/BlocksOfTheUndead/assets/lvls/2/4.txt is in blocks-of-the-undead-data 1.0-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//11//
//1///
//211/
//322/
//433/
//544/
//051/
//100/
//211/
//322/
//433/
//544/
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