Logic Masters Deutschland e.V.

My thanks to Calvinball, ChinStrap, and Nico for their early testing and feedback to improve the puzzle and rules wording.

Rules:

Normal 6x6 sudoku rules apply.

Taxicab distance:
The taxicab distance between two cells is the minimum number of orthogonal steps required to move between them.

Nearest neighbor distance:
A cell's nearest neighbor distance is the minimum taxicab distance to a cell with the same digit as itself.

Shapes:
Cells with circles have digits equal to their nearest neighbor distance.
Cells with squares have digits lower than their nearest neighbor distance.
Not all shapes are necessarily given.

Please leave a comment if you enjoy :)