Logic Masters Deutschland e.V.

Links: f-puzzles link
CTC app link

Rules:

• -Standard X-sudoku rules apply (standard sudoku and in addition, digits can't repeat along the main diagonals, indicated by black lines).
• -Box 5 is a magic square. All 3-digit-long row, column or diagonal within box 5 sums to the same total.
• -Quadruples : any digit inside a circle must be present at least once in the 4 adjacent cells.

Sorry for not posting on LMD over the past months, I've composed quite a few but have been rather busy with work and didn't take time to post the good ones here.. Going to try to catch up over the coming weeks :)

Hope you'll enjoy this one! :)