http://www.gchq.gov.uk/SiteCollectionImages/grid-shading-puzzle.jpg

data.json

{
  "rows": [
    [7, 3, 1, 1, 7],
    [1, 1, 2, 2, 1, 1],
    [1, 3, 1, 3, 1, 1, 3, 1],
    [1, 3, 1, 1, 6, 1, 3, 1],
    [1, 3, 1, 5, 2, 1, 3, 1],
    [1, 1, 2, 1, 1],
    [7, 1, 1, 1, 1, 1, 7],
    [3, 3],
    [1, 2, 3, 1, 1, 3, 1, 1, 2],
    [1, 1, 3, 2, 1, 1],
    [4, 1, 4, 2, 1, 2],
    [1, 1, 1, 1, 1, 4, 1, 3],
    [2, 1, 1, 1, 2, 5],
    [3, 2, 2, 6, 3, 1],
    [1, 9, 1, 1, 2, 1],
    [2, 1, 2, 2, 3, 1],
    [3, 1, 1, 1, 1, 5, 1],
    [1, 2, 2, 5],
    [7, 1, 2, 1, 1, 1, 3],
    [1, 1, 2, 1, 2, 2, 1],
    [1, 3, 1, 4, 5, 1],
    [1, 3, 1, 3, 10, 2],
    [1, 3, 1, 1, 6, 6],
    [1, 1, 2, 1, 1, 2],
    [7, 2, 1, 2, 5]
  ],
  "columns": [
    [7, 2, 1, 1, 7],
    [1, 1, 2, 2, 1, 1],
    [1, 3, 1, 3, 1, 3, 1, 3, 1],
    [1, 3, 1, 1, 5, 1, 3, 1],
    [1, 3, 1, 1, 4, 1, 3, 1],
    [1, 1, 1, 2, 1, 1],
    [7, 1, 1, 1, 1, 1, 7],
    [1, 1, 3],
    [2, 1, 2, 1, 8, 2, 1],
    [2, 2, 1, 2, 1, 1, 1, 2],
    [1, 7, 3, 2, 1],
    [1, 2, 3, 1, 1, 1, 1, 1],
    [4, 1, 1, 2, 6],
    [3, 3, 1, 1, 1, 3, 1],
    [1, 2, 5, 2, 2],
    [2, 2, 1, 1, 1, 1, 1, 2, 1],
    [1, 3, 3, 2, 1, 8, 1],
    [6, 2, 1],
    [7, 1, 4, 1, 1, 3],
    [1, 1, 1, 1, 4],
    [1, 3, 1, 3, 7, 1],
    [1, 3, 1, 1, 1, 2, 1, 1, 4],
    [1, 3, 1, 4, 3, 3],
    [1, 1, 2, 2, 2, 6, 1],
    [7, 1, 3, 2, 1, 1]
  ],
  "squares": [
    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  	[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
  ]
}