Normal Sudoku rules apply. Additionally:
1. Dutch whisper/equal sum lines: digits on grey lines must differ from their neighbors on the line by at least 4, and have an equal sum within each box the line passes through. Digits cannot repeat on lines.
2. X: cells separated by an X sum to 10. Not all Xs are given.
3. Ratio pairs: cells separated by a black dot have a 1:2 ratio. Not all dots are given.
4. Windoku: digits cannot repeat in cages.
F-Puzzles: https://f-puzzles.com/?id=26c39vs5
CTC: https://tinyurl.com/windowlining
Solution code: Row 1 and row 7, 18 digits.
on 18. June 2022, 16:47 by thoughtbyte
Adjusted difficulty.