/usr/share/vim-scripts/sokoban-levels/level55.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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