There are five difficulties to choose from.
All five puzzles have the same solution.A) Novice.
B) Apprentice (mainstream edition).
C) Master (68 Intersections, 3 Naked Pairs, 3 Naked Triplets, 5 Naked Quads,
1 Two String Kite in g2,
1 Finned Swordfish in g3,
1 Grouped Turbot Fish in g4).
Select to view GRID numbers.The 3 advanced techniques are needed in 3 different grids.D) Guru (75 Intersections, 13 Naked Pairs, 4 Naked Triplets, 5 Naked Quads, 1 Hidden Pair, 1 X-Wing, 1 Swordfish, 4 Two String Kites, 2 Empty Rectangles, 1 Turbot Fish, 1 Finned Swordfish, 3 Uniqueness Test 1, 2 XY-Wings, 3 XYZ-Wings, 2 Y-Wings, 1 Uniqueness Test 3, 1 Uniqueness Test 4, 1 XY-Chain, 2 XY-X-Chains up to 3 links).
E) Wizard.
Regular Clueless Special #15A (Novice)Rating based on required solving techniques: Moderate
005000000002400000000509043060000800400000030800000000010060000004000072200038510
210000000090400080700000540000000000007000200000000703000000000100030008500820970
600070000000030702005006000020000000008000130001000070000300000240000089100600300
000010050002050800103800000080000009700000000020000018000040000307000900840005207
000100300045060009000300060180000005050000023000000000007020000009046001200010500
000080400000005000423007090090000005002000000008000000000000082001600000500040000
000000030080000907205079000007000004004000000000000500000000093503006000600802000
000070020080001000600000010000000000000000000406000570003005607800000000270080009
000006539570080000000010000030000600008000000020000070000000040000139002180005006
Regular Clueless Special #15B (Apprentice)Rating based on required solving techniques: Moderate
005000000002400000000509043060000800400000030800000000010060000004000072200038510
210000000090400080700000540000000000007000200000000703000000000100030008500820970
600070000000030702005006000020000000008000130001000070000300000240000089100600300
000010050002050800103800000000000009700000000020000018000000000307000900840005207
000000300045060009000300060180000005050000023000000000007020000009046001200010500
000080400000005000423007090090000005002000009008000000000000082001600000500040000
000000030080000907235079000007000004004000000000000500000000093503006000600802000
000070020080001000600000010000000000000000003406000500003005607800000000270080009
000006539500000000000010000030000600008000000020000070000000040000139002180005006
Regular Clueless Special #15C (Master)Rating based on required solving techniques: Extra Hard
005000000002400000000009043060000800400000030800000000010060000004000072200038510
210000000090400080700000540000000000007000200000000703000000000100030008500820970
600070000000030702005006000020000000008000130001000070000300000240000089100600300
000010050002050800103800000000000009700000000020000018000000000307000900840005207
000100300045060009000300060180000005050000023000000000007020000009046001200010500
000080400000005000423007090090000005002000000008000000000000082001600000500040000
000000030080000907235079000007000004004000000000000509000000093503006000600802000
000070020080001000600000010009000000000000003406000500003005607800000000270080009
000006539500000000000010000030000600008000000020000070000000040000039002180005006
Regular Clueless Special #15D (Guru)Rating based on required solving techniques: Ultra Hard
005000000002400000000509043060000800400000030800000000010060000004000072200008510
210000000090400080700000540000000000007000200000000703000000000100030008500820970
600000000000030702005006000020000000008000130001000070000300000240000089100600300
000010050002050800103800000000000009700000000020000018000040000307000900840005207
000100300045060009000300060180000005050000023000000000007020000009046001200010500
000080400000005000423007090090000005002000009008000000000000382001600000500040000
000000030080000907205079000007000004004000000000000509000500093503006000600802000
000070020080001000600000010009000000000000003406000500003005607000000000270080009
000006539500000000000010000030000600008000000020000070000000040000039002180005006
Regular Clueless Special #15E (Wizard)Rating based on required solving techniques: Nightmare
005000000002400000000509043060000800400000030800000000010060000004000072200008510
210000000090400080700000540000000000007000200000000703000000000100030008500820970
600000000000030702005006000020000000008000130001000070000300000240000089100600300
000010050002050800103800000000000009700000000020000018000040000307000900840005207
000100300045060009000300060180000005050000023000000000007020000009046001200010500
000080400000005000423007090090000005002000009008000000000000382001600000500040000
000000030080000907205079000007000004004000000000000509000000093503006000600802000
000070020080001000600000010009000000000000003406000500003005607000000000270080009
000006539500000000000010000030000600008000000020000070000000040000039002180005006