Logic Masters Deutschland e.V.

In the Crosshairs

This puzzle was originally published in the Caging Constraints Puzzle Pack, a pack of 45 Killer Sudoku puzzles each combined with one or two variants.
You can get a copy of Caging Constraints for free here.

Puzzle Rules:

• Normal Sudoku rules apply.
• There are cages in the grid. Numbers cannot repeat within cages.
• Black cages are normal killer cages. The digits in the cage must sum to the small clue in the top left corner of the cage.
• Red cages are psycho killer cages. Digits placed in cages point to boxes in the grid, and provide a referred digit which is the digit in the same position in the box that is pointed to. The referred digits in the cage must sum to the small clue in the top left corner of the cage. Referred digits may repeat.
  eg. If there is a 2 in a cage, then the referred digit will be the digit in the same position in box 2, and that is the digit that will contribute to the cage total.

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Solution checking will work with this grid.

Rules Example

In this example the 4 in the PK cage points to the cell in box 4 in the same position, so it points to a 1. The 3 in the PK cage points to box 3, in the same position so it points to a 2. 2+1=3, so three is the total of the PK cage.