/usr/share/games/BlocksOfTheUndead/assets/lvls/3/3.txt is in blocks-of-the-undead-data 1.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | 5
//////
//////
//////
//////
//////
///3//
///1//
///32/
///21/
///12/
///12/
/3223/
|