Devilish Sudoku 12/15/2024

[@AgusJiménez-d7j]

Hola Neil. En el minuto 3 hablas de un cuadrado y dice que no puede ser 689 y que tiene que ser un 8. Por qué ? Quedarían un cuadrado
6 9
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9 6

[@AnonimityAssured]

This is not at all diabolical if one spots a handy UR (62 = row 6 column 2):
62, 86, 15, 38, 23,
66, 58, 57, 59, 73,
11, 65, 41, 24, 29,
21, 46, 74 (UR, boxes 2 and 8),
44, 61 (hidden triple in box),
55, 76, 34, 36, 95,
87, 88, 98, 78, 92,
93, 12, 22, 17, 99,
83, 32, 27, 81, 72,
52, 33, 13, 37, 89,
48, 64, 44, 69, 53,
51, 49, 18, 77.
And even without the UR, there's only one slightly tricky step:
61 instead of 74 (hidden triple in box),
55, 49, 53, 87, 88,
48 (Skyscraper),
89, 99, 69, 77, 95,
36, 34, 76, 74, 45,
44, 64, 72, 51, 52,
33, 81, 98, 78, 92,
93, 12, 22, 32, 27,
13, 37, 17, 18, 83.
These notation-free paths are not suggested to be optimal. They are just the ones I found.