Logic Masters Deutschland e.V.

After doing Stranded Friends by DarthParadox i was inspired by the friendly cell constraint used in that puzzle. You can play that puzzle here:

Puzzle:

Rules for this puzzle:

1. Normal sudoku rules apply.

2. Clues outside the grid give the sum of the X first cells seen in the direction of the clue, where X is the value of the first cell.

3. There are exactly fifteen friendly cells in the grid. (A friendly cell contains its row number, column number, or box number; numbers are assigned left to right and then top to bottom.)

Solve Online :

Happy Solving!!!