/usr/share/vim-scripts/sokoban-levels/level57.sok is in vim-scripts 20130814ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#@ ### # # #
# # # # $ $ #
##### # $ $#$# #
#.#..# ##$ $ #
#..... $ # ##
#..... ###$##$###
#.#..# $ # #
##### # #$ $ #
##### # $ $ $ #
##### # # # # #
####################
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