Logic Masters Deutschland e.V.

XV Pairs: Cells separated by an X must sum to 10. Cells separated by a V must sum to 5. Unmarked pairs of cells may have any sum.

Parity Party: Clues outside the grid give the sum of digits starting from the position of the clue up to and including either the first even or the first odd digit. Additionally, each parity party clue contains exactly one X or V.

f-puzzles: https://f-puzzles.com/?id=y8eebhew
CTC: https://tinyurl.com/bp4tcenn