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There are three difficulties to choose from.
All three puzzles have the same solution.

The difficulty levels explained     The ratings explained

A) Novice.
B) Apprentice (mainstream edition).
C) Master-1 (70 Intersection, 5 Naked Triplet, 3 Naked Quad, 1 XY-Wing on 1 in g8, 1 Y-Wing on 4 in g6). Select to view details.
The advanced techniques are needed in 2 different grids.
D) Master-2 (52 Intersection, 1 Naked Pair, 2 Naked Triplet, 2 Naked Quad, 1 Hidden Pair, 2 LATE Skyscraper: one on 5 in g6 and one on 5 in g8, 1 VERY LATE XY-Chain with 4 cells on 9 in g3, 1 VERY LATE X-Wing on 1 in g3). Select to view details.
The advanced techniques are needed in 3 different grids.
E) Grand Master (67 Intersection, 3 Naked Pair, 6 Naked Triplet, 2 Naked Quad, 1 Hidden Pair, 3 Empty Rectangle: one Intergrid on 4 in g3 and g10, one Intergrid on 8 in g3 and g10 and one on 9 in g10). Select to view details.
The advanced techniques are needed in 2 different grids.



Regular Clueless Explosion #56A (Novice)

Rating based on required solving techniques:  Moderate

000000000000000000802350060050000000000000904001700003000000000000004009076085000
000080020007000300001003009050000000000600000000040260010000000003006507800100090
010084600006000004700000000000900000007008000000000028002000040000005000105206300
000000000100000000500360040020900000000000405005010600000000067000004000082001000
004000013008001000007003008000020000002000700300000200580000000000900400000000000
003200780200000004000001000000000003000100005026050000000040000001306008700800006
040000020000000000800003005000902000001000700000500040000000004003007800098000050
007090032000000700900000000000800000001005000000002053010700000000000900009008600
003090000006007000000100000700000004000000009502900600800070000000004206027000000




Regular Clueless Explosion #56B (Apprentice)

Rating based on required solving techniques:  Moderate

000000000000000008002350060059003000000000904001700003000900000000004000900085000
000080020007000300001063009050000000000600000000040260010000000003006507800100090
010084600000000000700000000500900003007008000000000028000000040400000000105006300
000009006100000000500360040020900000000000400005010600000800067000004000082001000
004000013000001000007000008000008300002300000000000200580200007000905000000000000
600200700000000004000030000000000003900108005026000000060040000001300008700810036
006700900000000000800003000000902000001000000000500040000080204003007000090000050
107590030000000000900000000300800070001000000000002053410000005000000900009058600
003090000006007105000000000700050004000000009502000600800070000009800006000000000




Regular Clueless Explosion 56C (Master-1)

Rating based on required solving techniques:  Not really Super Hard

000000000000000000802350060050000000000000900001700003000000000000004009076085000
000080020007000300001003009050000000000600000000040260010000000003006507800100090
010084600006000004700000000000900000007008000000000028002000040000005000105206300
000000000100000000500360040020900000000000405005010600000000067000004000082001000
004000013008001000007003008000020000002000700300000200580000000000900400000000000
003200780000000004000001000000000003000100005026050000000040000001306008700800006
040000020000000000800003005000902000001000700000500000000000004003007800098000050
007090032000000700000000000000800000001005000000002053010700000000000900009008600
003090000006007000000100000700000004000000009502900600800000000000004206027000000



Regular Clueless Explosion 56D (Master-2)

Rating based on required solving techniques:  Not really Ultra Hard

000000000000000008002350060059003000000000904001700003000900000000004000900085000
000000020007000300001063009050000000000600000000040260010000000003006507800100090
010084600006000004700000000000900000007008000000000028002000000000005000105206300
000009006100000000500360040020900000000000400005010600000800067000004000082001000
004000013000001000007000008000008300002300000000000200580200007000905000000000000
600200700000000004000030000000000003900108005020000000060040000001300008700810036
006700900000000000800003000000902000001000002000500000000080204003007000090000050
107590030000000700900000000300800070001000000000002050410000005000000900009008600
003090000006007105000000000700050004000000009502000600800070000009800006000000000



Regular Clueless Explosion 56E (Grand Master)

Rating based on required solving techniques:  Much harder than Extra Hard

000000000000000000802350060050000000000000904001700003000000000000004009076085000
000080020007000300001003009050000000000600000000040260000000000003006507800100090
010084600006000004700000000000900000007008000000000028002000040000005000105206300
000000000100000000500360040020900000000000405005010600000000067000004000082001000
004000013008001000007003008000020000002000700300000200580000000000900400000000000
003200780200000004000001000000000003000100005026050000000040000001306008700800006
040000020000000000800003005000902000001000700000500040000000004003007800098000050
007090032000000700900000000000800000001005000000002053010700000000000900009008600
003090000006007000000100000700000004000000009502900600800070000000004206027000000

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