Logic Masters Deutschland e.V.

Place the digits 1-9 into each row, column, and region. Regions are to be determined by the solver.

Each region has an “index”. A region's index is the digit found in the leftmost cell of said region’s highest row. All regions must have a unique index.

In each region, numbers with the same parity as the index cannot orthogonally touch one other. For example, if a region’s index were 7, then within that same region odd numbers could not touch orthogonally. (look at attached image of the example puzzle for reference)

Quadruple clues assign region indexes to surrounding cells. The digits in a quadruple clue correspond to the grid cell that they are found within. For example, the 4442 quadruple (in columns 2 and 3) indicates that R2C2, R2C3, and R3C2 are each part of a region with index number 4, and R3C3 is part of a region with index number 2.

Digits separated by a white dot must be consecutive and must belong to different regions. Not all dots are given.