/usr/share/games/pipenightdreams/levels/10.level is in pipenightdreams-data 0.10.0-14build1.
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 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | #The level structure must begin with the word "pipenightdreams"
pipenightdreams{
  speed=14			#defines the speed of the flow, must be >=1
  level=1			#not used
  start_delay=1000		# between 0..2000
  graph_dir="pipes_toys"	#first directory to search for graphics
  graph_dir="flow_light"
  graph_dir="arrows_yellow"
  graph_dir="default"
  restrict_coef=10		#defines the % of restricted connections
  fixed_coef=6			#defines the % of fixed pipes
  background=mosaic		#defines the type of the background
  required=24
  entry{			#entry attributes block
    row=6
    column=0
    side=north
  }
  exit{                         #exit attributes block
    row=3
    column=4
    side=south
  }
  pipe{
    row=0
    column=0
    type=elbow_se
    fixed=yes
    restricted_output=east
  }
  pipe{
    row=1
    column=2
    type=elbow_se
    fixed=yes
    restricted_output=east
  }
  pipe{
    row=0
    column=6
    type=elbow_sw
    fixed=yes
    restricted_output=south
    bonus=super
  }
  pipe{
    row=5
    column=6
    type=elbow_nw
    fixed=yes
    restricted_output=west
    bonus=super
  }
  pipe{
    row=5
    column=2
    type=elbow_ne
    fixed=yes
    restricted_output=north
    bonus=ultra
  }
  pipe{
    row=1
    column=5
    type=elbow_sw
    fixed=yes
    restricted_output=south
    bonus=hyper
  }
  pipe{
    row=4
    column=5
    type=elbow_nw
    fixed=yes
  }
}
 |