There are three difficulties to choose from.
All three puzzles have the same solution.
A) Apprentice (mainstream edition).
B) Master (15 Intersections, 4 Naked Pairs, 1 2-String Kite, 1 Finned Swordfish).
C) Guru (22 Intersections, 7 Naked Pairs, 1 Naked Triplet, 2 Naked Quads, 2 Skyscraper, 1 2-String Kite, 1 Finned X-Wing, 1 Finned Swordfish, 1 XYZ-Wing, 1 XY-Chain up to 5 links).
Regular Samurai #9A (Apprentice)
Rating based on required solving techniques: Barely Hard
350020000000000700700590020000700000800010300240003806000000000028000000000040050
009510030400000102200000000000074000600000800000091300000007001000005070000000000
000030000000080000050100000010026000000400100005009007000001000000000090000002700
000000000039000000000070000080004300900760000005030970020000000048502000001000005
000000001090004000700200030407000006050071090000000000000057004000008900008190020
Regular Samurai #9B (Master)
Rating based on required solving techniques: Extra Hard
350020000000000700700590020000700000800010300240003806000000000028000007000040058
009510030400000102200000000000074000600000800000091300000007001000005070000000000
000030000007080000058100000010026000002000100005009007000001000000040090000002700
000000000039000000000070000080004300900760000005030970020000000048502000001000005
000000000090004000700200030407000006050071090000000000000057004000008900008190020
Regular Samurai #9C (Guru)
Rating based on required solving techniques: Barely Ultra Hard
350020000000000700700590020000700000800010300240003806000000000028000007000040058
009510030400000102200000000000074000600000800000091300000007001000005070000000000
000030000007080000058100000010026000000400100005009007000001000000000090000002700
000000000039000000000070000080004300900760000005030970020000000048502000001000005
000000000090004000700200030407000006050071090000000000000057004000008900008190020