Normal Sudoku rules apply. Each row, column, and 3x3 box contains each number from 1 to 9 exactly once.
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)!
The even numbers (2, 4, 6, 8) cannot be a knight's move away from each other (2s from 2s, 4s from 4s, etc).
Digits along the thermometer must increase from the bulb end.
The puzzle is also available online.
Lösungscode: Row 1 and Column 8