Logic Masters Deutschland e.V.

This is my second puzzle using the “outside the box” rule. Cracking the Cryptic featured my first “outside the box” puzzle here:

https://youtu.be/2ideCV0Ot_Q?si=j_tcyZlEnPq-60yY

watching that video might help explain the rule.

I have used different constraints and added a twist to this one.

The rules:

Normal sudoku rules apply.

Normal renban rules apply. Digits on a purple line are a set of consecutive digits in any order without repeats.

Normal diagonal constraint rules apply. Digits on the marked diagonals do not repeat.

Normal circle sum rules apply. A digit in a circle is equal to the number of circles that contain the digit.

"Think outside the box" rule applies: a digit in the center cell of a bold outlined 3x3 box is equal to the total of all circled digits in cells outside the box and adjacent to the box, including diagonally adjacent cells.

The 9 "thinking" cells in the centers of the bold outlined 3x3 boxes contain the digits 1 to 9 once each.

Sven Neumann’s Sudokupad