There are four difficulties to choose from.
All four puzzles have the same solution.A) Apprentice (mainstream edition).
B) Master (71 Intersections, 5 Naked Pairs, 4 Naked Triplets).
C) Guru (79 Intersections, 8 Naked Pairs, 5 Naked Triplets, 2 Naked Quads, 2 Hidden Pairs, 4 Skyscraper, 4 Turbot Fishes, 3 Finned X-Wing, 1 Finned Swordfish, 2 Grouped X-Wing, 5 Grouped Turbot Fishes, 2 XY-Wings, 1 XY-Chain up to 5 links).
D) Wizard
Regular Clueless Explosion #9A (Apprentice)Rating based on required solving techniques: Moderate
000500000100300000300000758001000002000000000030105007000000280006009003004007000
000000900600009400040000007060100000800600700007094800000060000003001000006000073
009021000000000000007000002000000008001002000800043900050600000000400100704000600
000000003008000000006010090600000000000006000900001470050000008000203000203500100
030060000000700500700005040000000009000004800002090600000000000000600002004028000
020000005000300008000100000800040000000000000090000301700000000000009000010600790
100000000400000008008001245000000000000600300007084900050100000000000000090008073
080000000000200008097800300000070000008002000100400005000900010000000004500008060
000900000005300000100700203000006080003000700408050000004092005500000000000000096
Regular Clueless Explosion #9B (Master)Rating based on required solving techniques: Hard
000500000100300000300000758001000002000000000030105007000000280006009003004007000
000000000000009400040000007060100000800600700007094800000060000003001000006000073
009021000000000000007000002000000008001002000800043900050600000000400100704000600
000050003008000000006010090600000000000006000900001470050000008000203000203500100
030060000000700500700005040000000009000004800002090600000000000000600002004028000
020000005000300008000100000800040000000000000090000301700000000000009000010600790
100000000400000008008001245000000000000600000007084900000100000000000000090008073
080000000000200008097800300000070000008002000100400005000900010000000004500008060
000900000005300000100700203000006080003000700408050000004002005000000000000000096
Regular Clueless Explosion #9C (Guru)Rating based on required solving techniques: Ultra Hard
000000000100300000300000758001000002000000000030105007000000280006009003004007000
000000000000009400040000007060100000800600700007094800000060000003001000006000073
009021000000000000007000002000000008001002000800043900050000000000400100704000600
000050000008000000006010090600000000000006000900001470050000008000203000203500100
030060000000700500700005040000000009000004800002090600000000000000600002004028000
023000005000300008000100000800040000000000000090000301700000000000009000010600790
100000000400000008008001245000000000000600000007084900000100000000000000090008073
000000000000200008097800300000070000008002000100400005000900010000000004500008060
000900000005300000100700203000006080003000700408050000004002005000000000000000096
Regular Clueless Explosion #9D (Wizard)Rating based on required solving techniques: Nightmare DeLuxe
000000000100300000300000758001000002000000000030105007000000200006009003004007000
000000000000009400040000007060100000800600700007094800000060000003001000006000073
009021000000000000007000002000000008001002000800043900050000000000400100704000600
000050000008000000006010090600000000000006000900001470050000008000203000203500100
030060000000700500700005040000000009000004800002090600000000000000600002004028000
020000005000300008000100000800040000000000000090000301700000000000009000010600790
100000000400000008008001245000000000000600000007084900000100000000000000090008073
000000000000200008097800300000070000008002000100400005000900010000000004500008060
000900000005300000100700203000006080003000000408050000004000005500000000000000096
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