There were two palindromes, one Renban, a German whisper, a 15 line, a 28 line and a 29 line in the grid. Each line started in a grey cell in row 2 and finished in a grey cell in row 8. The lines moved orthogonally from cell to cell without crossing or sharing cells.
Normal sudoku rules apply.
Palindromes read the same forwards and backwards.
The Renban contains a set of consecutive digits in any order.
Adjacent digits on the German whisper differ by 5 or more.
The 15 line contains 15 digits or digits totalling 15.
The 28 line contains 28 digits or digits totalling 28.
The 29 line contains 29 digits or digits totalling 29.
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Solution code: The digits that appear exactly once on the 15 line. Smallest to largest.
on 31. October 2023, 20:15 by SeveNateNine
Beautiful puzzle, and very tough. Took me a long time to understand the mechanics of the different lines, but it paid off. Thanks!