Logic Masters Deutschland e.V.

by NinjaRat Productions
(AnalyticalNinja and rockratzero)
The two of us have been producing sort of "dueling puzzles" based on us implementing the same double-duty constraints for a while. This is our first full collab, where, after deciding on our dual-purpose constraints, we sent the puzzle back and forth, one clue at a time. We really like how this turned out, and hope you will to!

Normal Sudoku Rules Apply

Ninja constraint: Whisper Arrows
Whispers. Adjacent digits on a green line must vary by at least 5.
Arrows. Digits on the arrow must sum to the value in the bulb. Double-digit numbers in a bulb are read top-to-bottom.

Rat constraint: Diagonal X/Sandwich Sums
Diagonal Sandwiches. Clues outside the grid indicate the sum of digits sandwiched between the "1" and "9" found in the direction of the indicated diagonal.
Diagonal X-Sums. Clues outside the grid are also X-Sums, which indicate the sum of the first X digits seen along the indicated diagonal, where X is the first digit seen.