Logic Masters Deutschland e.V.

Normal sudoku rules apply. Place the digits 1-6 without repeating in each row/column/box.

Colour the grid into 4-cell tetromino shaped regions. No two similar shapes may share a border, including rotational and mirrored shapes(Ex, a J and L piece cannot share an edge.) Each tetromino must contain a + and - cell, and all tetromino regions sum to the same value. Digits cannot repeat within a tetromino.

Within any shaded region, the '+' cell has a greater value than the '-' cell.

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