Logic Masters Deutschland e.V.

Normal sudoku rules apply. In addition:

• Green Cells: If a cell in box N is green, then the digit in that cell is the number of boxes in the completed grid which have N in the same position as that green cell. For instance, if R1C9 is green and contains a 1, then there is exactly 1 box which has 3 in the upper right-hand corner (because R1C9 is in the upper right-hand corner of box 3). There is no negative constraint; not all possible green cells are necessarily given.
• XV Adjacent cells connected with an X must sum to 10. Adjacent cells connected with a V must sum to 5. There is no negative constraint. Not all possible Xs and Vs are necessarily given.

F-puzzles: https://f-puzzles.com/?id=yyfp34zo

CTC: https://tinyurl.com/39cwxcdt