Logic Masters Deutschland e.V.

- 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.

f-puzzles link - link to online solve tool.

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.