Logic Masters Deutschland e.V.

Sudoku: Normal Sudoku rules apply; place the digits 1-9 once in every row, column, and 3x3 box.

Yin Yang: Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 area is fully shaded or fully unshaded.

Double: The value of shaded cells are double their digit.

Arrow: The value of a cell with an arrow counts the number cells seen in the direction indicated by the arrow that share its shading, with sight blocked by a cell of opposite shading. Arrows do not count themselves.

Circle: A value in a cell with a circle counts the number of unshaded cells seen in its surrounding 3x3 area, including itself.

Square: A value in a cell with a square counts the number of shaded cells seen in its surrounding 3x3 area, including itself.

Region Sum Line: Blue lines are divided by the 3x3 box borders into sums of equal value.

Equality Loop: Cells on a gray loop an equal distance apart have the same value, e.g. r1c1 has the same value as r3c2.

Expected Difficulty: 2.5 stars

This was set for Scojo's Setting Saturday Prompt, this week chosen by the Wheel: Yin-Yang and Doublers!

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