Interference
(Published on 6. February 2026, 17:00 by Tobias Brixner)
Puzzle link: Play on SudokuPad.
Rules: Normal Sudoku rules apply. For each arrow separately, all cells in arrow direction sum to a multiple of the arrow cell.
Your feedback, ratings and comments are highly appreciated. Have fun!
Background: This puzzle plays with the physical phenomenon of interference, in which the amplitudes of several waves overlap and add up. When a wave is split and then recombined, the interference signal is at its maximum when the path difference is an integer multiple of the wavelength. Therefore, the integer multiple is used as the central element in this puzzle.
Example: The following image provides a fully solved example on a 4x4 grid. You may solve the example for yourself here on SudokuPad.
Solution code: All digits of row 9 (from left to right) without spaces.
