Normal Sudoku rules apply. Each row, column, and 3x3 box contains each number from 1 to 9 exactly once.
Sandwich Sudoku rules apply. The numbers outside the grid show the sum of the digits sandwiched between 1 and 9 in that row or column.
The small circles with three numbers in them are forming quadruples. The four cells around a circle must contain the same numbers in some order. In each circles you have to figure out what is the remaining number.
Digits along the thermometers must increase from the bulb end.
The puzzle is also available online.
Lösungscode: Row 4 and Row 6.