Logic Masters Deutschland e.V.

I made this puzzle for my friend's birthday (born in 1986, turning 39 years old).
Do not expect a full Fog of War sudoku. The fog is only here as a present wrapper.

Rules
Normal sudoku rules apply.
The grid is covered in fog. Placing a correct digit will clear the fog from that cell and potentially from other cells somewhere in the grid.
Within a cage, digits must not repeat and they sum to the cage total. In this puzzle, all cages have the same total, which must be deduced by the solver.
The gray line is a palindrome, which contain the same sequence of digits in either direction.
Along green lines, adjacent digits differ by at least 5.

Play this puzzle on SudokuPad