Logic Masters Deutschland e.V.

This is my second puzzle, so any suggestions for feedback would be really great.

Normal Sudoku rules apply. For the digits 1-8, exactly all but 1 instance of each digit has at least 1 friend. Friends are two of the same digit. Each digit indicates the length of cells diagonally in which it must see a friend. The 1s must be placed with 90 degree rotational symmetry. Cells connected with a white dot are consecutive and the larger digit MUST have a friend. Cells connected with a black dot have a 2:1 ratio and the larger digit CANNOT have a friend. Not all dots are given. Cages with sum totals indicate how many friends the cell in the cage sees. The contents of the cage equals x. Digits cannot repeat within a cage. Numbers outside the grid indicate the sum of digits along the diagonal.

Here is an example grid of how friends work

Note the three 1s in rows 3,4,5. The 1 in column 2 sees both of the other 1s because they are within 1 cell diagonally.

The 2 in row 1 does not see the 2 in column 1, hence the black dot between the 1 and 2 in column 4.

The 4 in column 1 does not see another 4 within 4 cells diagonally, so all other 4s in the puzzle must see a friend.

The 1 and 2 in column 1 are connected by a white dot because the larger digit, 2, has a friend in r6c3.

F-Puzzles