There are four difficulties to choose from.
All four puzzles have the same solution.A) Novice.
B) Apprentice (mainstream edition).
C) Master (80 Intersections, 2 Naked Pairs, 3 Naked Triplets, 3 Naked Quads,
1 Empty Rectangle in g8).
Select to view GRID numbers.D) Grand Master (90 Intersections, 5 Naked Pairs, 6 Naked Triplets, 5 Naked Quads,
1 X-Wing in g8,
1 Y-Wing in g10,
1 Grouped X-Wing in g1).
Select to view GRID numbers.The 3 advanced techniques are needed in 3 different grids.I will post a second post with a Walktrough of the Grand Master level puzzle, including an explanation of the Grouped X-Wing.Regular Clueless Explosion #21A (Novice)Rating based on required solving techniques: Moderate
008000002000800000060040700007100000002007000090000006000032005000400000030090600
000700000306000000007005104090000000000000809700500300000000030005000000000600002
000000000208000000000105900000700050000008000806094300000000000609000000004000073
300000000001008000009000803906000000000006000400009018000080701000600000035070200
000720000000000900009400000013008000000003006007000000000100000000000800408000605
036000091000000000070300000100000000000000908092060500000020004500001200000008000
000008000000000001042007005000070000100000900908030010000000009300002000001050730
500000600006000000000062700000090020007003000950007400005304010600000003090500200
000004003000800000050000027000000006005009000001003040004000000706000000000200070
Regular Clueless Explosion #21B (Apprentice)Rating based on required solving techniques: Moderate
008000002000800000060040700007100000002007000090000006000032005000400000030090600
000700000306000000007005104090000000000000809700500300000000030005000000000600002
000000000208000000000105900000700050000008000806094300000000000609000000004000073
300000000001008000009000803906000000000006000400009018000000701000600000035070200
000720000100000900009400000013008000000003006007000000000100000000000800408000605
036000091000000000070300000100000000000000008092060500000020004500001200000008000
000008000000000001042007005000000000100000900908030010000000009300002000001050730
500000600406000000000062700000000020007003000950007400005004010000000003090500200
000004003000800000050000027000000006005009000001003040004000000706000000000200070
Regular Clueless Explosion #21C (Master)Rating based on required solving techniques: Extra Hard
008000002000800000060040700007100000002007000090000006000032005000400000030090600
000700000306000000007005104090000000000000809700500300000000030005000000000600002
000000000208000000000105900000700050000008000806094300000000000609000000004000073
300000000001008000009000803906000000000006000400009018000000701000600000035070200
000720000100000900009400000003008000000003006007000000000100000000000800408000605
036000091000000000070300000100000000000000008092060500000020004500001200000008000
000008000000000000042007005000000000100000900908030010000000009300002000001050730
500000600406000000000002700000090020007003000950007400005304010000000003090500200
000004003000800000050000027000000006005009000001003040004000000706000000000200070
Regular Clueless Explosion #21D (Grand Master)Rating based on required solving techniques: Super Hard
008000002000800000060040700007100000002007000090000006000032005000400000030090600
000700000306000000007005104090000000000000809700500300000000030005000000000600002
000000000208000000000105900000700050000008000806094300000000000609000000004000073
300000000001008000009000803906000000000006000400009018000080701000600000035070200
000720000000000900009400000013008000000003006007000000000100000000000800408000605
036000091000000000070300000100000000000000908092060500000020004500001200000008000
000008000000000001042007005000070000100000900908030010000000009300002000001050730
500000600006000000000002700000090020007003000950007400005304010600000003090500200
000004003000800000050000027000000006005009000001003040004000000706000000000200070
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