There are four difficulties to choose from.
All four puzzles have the same solution.A) Novice.
B) Apprentice (mainstream edition).
C) Master (73 Intersections, 8 Naked Pairs, 5 Naked Triplets, 4 Naked Quads, 1 X-Wing, 1 Skyscraper, 1 XYZ-Wing).
D) Guru (74 Intersections, 8 Naked Pairs, 7 Naked Triplets, 8 Naked Quads, 1 Hidden Pair, 1 X-Wing, 1 Skyscraper, 1 2-String Kite, 2 Finned X-Wing, 1 Finned Swordfish, 1 XY-Wing, 4 XYZ-Wings, 1 XY-Chain up to 5 links, 1 XY-Chain).
Regular Clueless Special #6A (Novice)Rating based on required solving techniques: Moderate
000930000050000040000080509200000700070000400540000038005100070160000005000050004
300207008000000300009004010906000800050000093003000000060708000000060200700400001
000000300600030010030549200005000402000000000060000000000420970041005000370001500
053000000000049080402050070006000003008000150010000000690003020000007600000400900
020060100000000806000750000000000058040000009509000000003074000100000007004180603
007000004000004708030507600900000080000000109670000500001006090006900805000002000
040002600070100000003076001002000009600000050090000003000765300007000000000800017
750020000004006200000400570100000005470000900000000040001607008009000000000002401
000007500007200008094806003030000000021000084008000000002050830300068200000000000
Regular Clueless Special #6B (Apprentice)Rating based on required solving techniques: Tough
000930000050000040000080509200000000070000000540000038000100070160000005000050004
300200008000000300009004010900000800050000093003000000060708000000060200700400001
000000000600030010030549200005000402000000000060000000000020900041000000370001500
003000000000049080402050070006000003008000150010000000090000020000007600000400900
020060100000000806000750000000000058040000000509000000003074000100000007004180603
007000004000004008030507600900000080000000109670000500001006000006900805000002000
040002600000100000003076001002000009600000050090000003000065300007000000000800017
750020000004006200000000570100000005070000900000000040001600008009000000000002401
000007500007200008094006003030000000021000084008000000000050830300060200000000000
Regular Clueless Special #6C (Master)Rating based on required solving techniques: Super Hard
000930000050000040000080509200000700070000000540000038000100070160000005000050004
300207008000000300009004010900000800050000093003000000060008000000060200700400001
000000000600000010030549200005000402000000000060000000000020900041000000370001500
003000000000049080402050070006000003008000150010000000090000020000007600000400900
020060100000000806000750000000000058040000009509000000003004000100000007004180603
007000004000004008030507600900000080000000109670000500001006000006900805000002000
040002600000100000003076001002000009600000050000000003000065300007000000000800017
750020000004006200000400570100000005070000900000000040001600008009000000000002401
000007500007200008094006003030000000021000084008000000000050830300068200000000000
Regular Clueless Special #6D (Guru)Rating based on required solving techniques: Ultra Hard
000930000050000040000080509200000000070000000540000038000100070160000005000050004
300200008000000300009004010900000800050000093003000000060008000000060200700400001
000000000600000010030549200005000402000000000060000000000020900041000000370001500
003000000000049080402050070006000003008000150010000000090000020000000600000400900
020060100000000806000750000000000058040000009509000000003004000100000007004180603
007000000000004008030507600900000080000000109670000500001006000006900805000002000
040002600000100000003076001002000009600000050000000003000065300007000000000800017
750020000004006200000400570100000005470000900000000040001600008009000000000002401
000007500007200008094006003030000000021000084008000000000050830300060200000000000
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