Logic Masters Deutschland e.V.

Play on SudokuPad!

Normal sudoku rules apply.

Cageless Yin Yang: Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 cluster of cells is entirely shaded or unshaded. Cells in a cage do not count as shaded or unshaded.

Secret Summit: Every orthogonal path that is fully contained within shaded cells must increase or decrease, with 1 and 9 reversing the direction. Every orthogonal path along unshaded cells must do the same.

Vision Arrows: A digit on an arrow indicates the length of the uninterrupted run of cells immediately beyond the arrow, in the arrow's direction, that belong to the same group of shaded/unshaded cells as the arrow cell.

Thermometers: Cells on a thermometer are either all shaded or all unshaded. Digits along a thermometer increase from the bulb.

Killer Cages: Digits in a cage sum to the number in the top-left of the cage.