Logic Masters Deutschland e.V.

When I was solving mathpesto's "Checkered" puzzle, I initially misinterpreted the Battenberg ruleset to mean something else!

Despite working off the wrong rules, what followed was a pretty neat opening sequence of deductions (up until the sudoku broke). This puzzle attempts to preserve that break-in as faithfully as possible.

Rules:

• Region sum lines: Digits on a blue line have the same sum in each 3x3 box the line is in.
• Dynamic fog: Most of the grid is covered in fog. Placing a correct digit may clear some fog somewhere in the grid.
• Grey squares: Whenever a 2x2 block of cells contains exactly 2 odd and 2 even digits, a grey square symbol is given. If there is no symbol, the composition is not allowed.

Solve online: Sudokupad

Happy solving!