Classic: Normal Sudoku rules apply
Arrow: There are some arrows shown in the grid. The digits on the arrow path add to the digit in the circled cell. Digits can repeat on the arrow if allowed by the other rules.
Disjoint group: no two cells in the same position relative to their box may contain the same digit.
Palindromes: Grey Lines are palindromes, the digits read the same forward and backward.
Kropki: Cells separated by a white dot must be consecutive.
Lösungscode: Col 5 then row 7, no spaces