Logic Masters Deutschland e.V.

RULES

QUATTROQUADRANTS
– The grid contains four overlapping Quattroquadri (QQ) grids, outlined in a color matching the clues within it.
– Each QQ contains four 3x3 square regions that each contain the numbers 1-9, without repeating within a row or column of the 6x6 area that this QQ occupies. Digits may repeat within a full nine cell row or column of the grid so long as each QQ is valid.

• LOCKOUT LINES
— Diamonds on the ends of an ice blue line must differ by at least 4. Any digit on those lines must either be greater than, or less than, the digits in both attached diamonds.

• REGION SUM LINES
— The 3x3 box borders divide the sky blue lines into segments of the same sums.

• REMOTE SUMS
— A value X in a cage points to a second value Y located X cells away vertically or horizontally. The number in the top left corner of the cage indicates the sum of X+Y.
— For any QQ containing a Remote Sum clue, that clue must be fulfilled within that 6x6 grid (eg, a Remote Sum clue in the central box must be satisfied within all four QQ grids.)

• ZIPPER LINES
— Digits an equal distance from the dotted center of a lavender line must sum to the digit in the center of that line.

Play the puzzle on Sudokupad (Highlighted version, per below)
Play the puzzle on Sudokupad (Classic Sudoku grid version)