Normal sudoku rules apply. Place the digits 1-6 once each in every row, column, and 2x3 box.
Killer: digits inside a caged region must not repeat and sum to the total shown in the corner.
Region sum (blue) lines: box borders divide each blue line into segments. All segments on the same line have the same sum; different lines may have different sums.
Palindrome: digits along a grey line read the same forwards and backwards.
Between line: digits on a line between two circles are strictly between the values in those two circles.
Quadruples: each digit shown by a quadruple clue appears at least once in its four surrounding cells.
Cells connected by a V sum to 5. Not all Vs are given.
Solve in VariantDoku (iOS, macOS, Android) or on SudokuPad.
Lösungscode: Enter the digits of row 6.