{wildcat,
 [[0,0,0,2,6,0,7,0,1],
  [6,8,0,0,7,0,0,9,0],
  [1,9,0,0,0,4,5,0,0],
  [8,2,0,1,0,0,0,4,0],
  [0,0,4,6,0,2,9,0,0],
  [0,5,0,0,0,3,0,2,8],
  [0,0,9,3,0,0,0,7,4],
  [0,4,0,0,5,0,0,3,6],
  [7,0,3,0,1,8,0,0,0]]}.

{diabolical,
 [[0,2,0,6,0,8,0,0,0],
  [5,8,0,0,0,9,7,0,0],
  [0,0,0,0,4,0,0,0,0],
  [3,7,0,0,0,0,5,0,0],
  [6,0,0,0,0,0,0,0,4],
  [0,0,8,0,0,0,0,1,3],
  [0,0,0,0,2,0,0,0,0],
  [0,0,9,8,0,0,0,3,6],
  [0,0,0,3,0,6,0,9,0]]}.

{vegard_hanssen,
 [[0,0,0,6,0,0,4,0,0],
  [7,0,0,0,0,3,6,0,0],
  [0,0,0,0,9,1,0,8,0],
  [0,0,0,0,0,0,0,0,0],
  [0,5,0,1,8,0,0,0,3],
  [0,0,0,3,0,6,0,4,5],
  [0,4,0,2,0,0,0,6,0],
  [9,0,3,0,0,0,0,0,0],
  [0,2,0,0,0,0,1,0,0]]}.

{challenge,
 [[2,0,0,3,0,0,0,0,0],
  [8,0,4,0,6,2,0,0,3],
  [0,1,3,8,0,0,2,0,0],
  [0,0,0,0,2,0,3,9,0],
  [5,0,7,0,0,0,6,2,1],
  [0,3,2,0,0,6,0,0,0],
  [0,2,0,0,0,9,1,4,0],
  [6,0,1,2,5,0,8,0,9],
  [0,0,0,0,0,1,0,0,2]]}.

{challenge1,
 [[0,2,0,0,0,0,0,0,0],
  [0,0,0,6,0,0,0,0,3],
  [0,7,4,0,8,0,0,0,0],
  [0,0,0,0,0,3,0,0,2],
  [0,8,0,0,4,0,0,1,0],
  [6,0,0,5,0,0,0,0,0],
  [0,0,0,0,1,0,7,8,0],
  [5,0,0,0,0,9,0,0,0],
  [0,0,0,0,0,0,0,4,0]]}.

{extreme,
 [[4,0,5,0,0,9,1,0,2],
  [0,6,0,0,2,0,0,5,0],
  [0,0,0,0,0,0,0,0,0],
  [0,0,1,0,0,0,0,0,4],
  [0,3,0,0,5,0,0,8,0],
  [7,0,0,0,0,0,9,0,0],
  [0,0,0,0,0,0,0,0,0],
  [0,7,0,0,6,0,0,3,0],
  [1,0,4,5,0,0,8,0,6]]}.

{seventeen,
 [[0,0,0,7,0,0,0,0,0],
  [1,0,0,0,0,0,0,0,0],
  [0,0,0,4,3,0,2,0,0],
  [0,0,0,0,0,0,0,0,6],
  [0,0,0,5,0,9,0,0,0],
  [0,0,0,0,0,0,4,1,8],
  [0,0,0,0,8,1,0,0,0],
  [0,0,2,0,0,0,0,5,0],
  [0,4,0,0,0,0,3,0,0]]}.