Logic Masters Deutschland e.V.

- There are some thermometer shapes in the grid. Along these thermometers, digits must strictly increase from the bulb end.

- 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.

Psycho Killer with Thermo 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 1. 1+1=2, so 2 is the total of the PK cage.

Links to online solving tools

• CtC App
• f-puzzles

Solve Video

While I don't feel this is an extremely hard puzzle, the psycho killer ruleset can be a little confusing so I have created a solve video of the puzzle for people who want to see me explain the rules or get stuck with the puzzle.

Solve video on YouTube

People who do not want any help should just ignore the video, unless after they have solved it they want to see how I still struggle with my own puzzles.

Note: the video is in English.