Standard Sudoku, Renban, and Quadruple rules apply.
To avoid any ambiguity: there are exactly 3 renban lines in the puzzle. One branches in the upper left, and two of them extend continuously behind quadruple circles.
Link to sudokupad: sudokupad.app/f77q2sy0cj
Solution code: First column, top to bottom
on 28. January 2024, 18:53 by Fra314
Fantastic puzzle, insane geometry all around the grid and brilliant setting!
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