Prelims.
Delete 7,8,9 from cells either side of yellow marks.
Delete 9 from cells either side of green marks in even columns.
Delete 4,9 from cells either side of green mark in C5 (4 because of NC).
Delete 5 from cells either side of blue marks in R5.
Delete 1 from cells either side of red mark in R6
Delete 1,6 from cells either side of red marks in odd rows and columns (6 because of NC).
Delete 1,2,3 from cells either side of grey marks.
1a. R5C5 = 5, placed for R5 and C5
…
After a lot of placements and eliminations using AK, FNC and NC, separately or together, you will fairly quickly reach R3C6 = 6, R3C4 = 1 and then the rest is at the same level as the easier Mean ORCs.