Logic Masters Deutschland e.V.

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

Territorial Vampires: There exist 9 Vampire Cells in the grid such that there is exactly one Vampire Cell in each row, column, and 3x3 box. Digits in Vampire Cells do not repeat and have a value of 1 more than their digit. A Prey Cell must exist within a king's move within the same 3x3 box for each Vampire Cell.

Prey: There exist 9 Prey Cells in the grid such that there is exactly one in every 3x3 box, however they may share a row or column. Digits in a Prey Cell do not repeat and have a value of 1 less than their digit.

Black Kropki: Cells separated by a black dot have a ratio of 1:2.

White Kropki: Cells separated by a white dot have consecutive values.

Gray Kropki: Cells separated by a gray dot have equal values.

Expected Difficulty: 3 stars

---