Logic Masters Deutschland e.V.

Many thanks to sanabas for testing several broken versions of this puzzle. This one is not broken, I promise!

When you have eliminated the impossible,

whatever the remainders,

no matter the modulus,

must be the solution

Normal sudoku rules apply: Place the digits 1-9 once each in every row, column and 3×3 box.

Bouncing Modular X-Products: The notation A (mB) at an arrow indicates that A is the product of the first N digits in the direction of the arrow, up to a multiple of the modulus B, where N is the first digit the arrow points at. If N is larger than the diagonal an arrow points at, the reflected diagonal is used as well.

Example: The clue in row 7 says, if r8c9 is a 4, then the product of the 4 digits at r8c9, r9c8, r8c7 and r7c6 must be equal to 8 + 15*k for some integer k.

Sudokupad