I'm most impressed that you got through this without pencil marks. It was actually quite hard in parts, with its numerous hidden singles. Andrew Stuart's Online Sudoku Solver rates it as Tough Grade 144, which takes it beyond the park and into busy traffic. Here's my path for a bit of contrast (68 = row 6 column 8): 68, 39, 91, 35, 94, 81, 95, 36, 17, 93, 42, 97, 96, 48, 31, 37, 78, 87, 27, 84, 74, 89, 79, 82, 85, 76, 83, 22, 42, 12, 24, 66, 28, 18, 25, 15, 23, 63, 71, 59, 69, 55, 67, 57, 14, 16, 56, 61, 51, 54, 43, 72, 73, 62, 11, 44, 64.
Enjoyable puzzle. Well done.
I'm most impressed that you got through this without pencil marks. It was actually quite hard in parts, with its numerous hidden singles. Andrew Stuart's Online Sudoku Solver rates it as Tough Grade 144, which takes it beyond the park and into busy traffic. Here's my path for a bit of contrast (68 = row 6 column 8):
68, 39, 91, 35, 94,
81, 95, 36, 17, 93,
42, 97, 96, 48, 31,
37, 78, 87, 27, 84,
74, 89, 79, 82, 85,
76, 83, 22, 42, 12,
24, 66, 28, 18, 25,
15, 23, 63, 71, 59,
69, 55, 67, 57, 14,
16, 56, 61, 51, 54,
43, 72, 73, 62, 11,
44, 64.
PPP solve 14 min. Not so easy , interesting puzzle Thanks.