Logic Masters Deutschland e.V.

This time I'm combining the deconstruction rule and zipper line rule. I really like the concept of 'blanks on the lines'. If using blank cells on the zipper lines, the centre of a zipper line will be unfixed. Hahahaha!

Rules:

• Deconstruction: Fill the grid with 9 non-overlapping 3x3 square regions, such that each region contains the digits 1-9 once each and no digit repeats in any row or column. Cells outside regions are blank cell that cannot contain digits.
• Zipper Line: (Lavender/#CC88DD) All zipper lines must have an effective length (the number of non-blank cells on that line) of an odd number not lower than 3. Ignoring the blank cell, the rest digits along the line must form a zipper sequence, where digits an equal distance from the centre of the sequence must sum to the digit in the centre of that sequence. (eg. a vaild filling of a 9-cell long zipper line is 001307406, where 0=blank cell. This is because ignoring the blank cells it will be 13746, a vaild zipper sequence.)

CTC unmarked version

CTC marked version