Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Each row, column, and 3x3 box contains each number from 1 to 9 exactly once.

The even numbers (2, 4, 6, 8) cannot be a knight's move away from each other (2s from 2s, 4s from 4s, etc).

All orthogonally adjacent cells with the sum of 5 are marked with a V, and with the sum of 10 are marked with an X. This is also a negative constraint (where there is no V or X between the cells, the sum of the 2 cells is not 5 or 10)!

Digits along the thermometers must increase from the bulb end.

The grey "snake" with the yellow background is a palindrome, which means it is a sequence of digits which reads the same backward as forward (for example: 1234321).

The puzzle is also available online.