/usr/share/vim-scripts/sokoban-levels/level31.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | ####
# #########
## ## # #
# $# $@$ ####
#$ $ # $ $# ##
## $## #$ $ #
# # # # $$$ #
# $ $ $## ####
# $ $ #$# # #
## ### ###$ #
# #.... #
####......####
#....####
#...##
#...#
#####
|