Zero star puzzle. Try solving this one in your mind.
Normal sudoku rules apply. Place the digits 1-4 once each in every row, column, and 2x2 box.
Killer: digits inside a caged region must not repeat and sum to the total shown in the corner.
Thermometer: digits must strictly increase along each thermometer, starting from the bulb.
Cells connected by a V sum to 5. Not all Vs are given.
Digits may not repeat along marked diagonals.
Solve in VariantDoku (iOS) or on SudokuPad.
Lösungscode: Enter the digits of row 4 (no spaces).