Logic Masters Deutschland e.V.

---

PUZZLE:

---

---

RULES:

---

Normal SUDOKU rules apply.

Values along an ARROW sum to the value in its attached circle.

Cells along a green GERMAN WHISPER line must differ in value by at least five [5].

Place NEGATOR cells into the grid so that there is exactly one Negator cell in each row, column and box; each Negator cell must contain a different digit and has the negative value of the contained digit (e.g. a digit 5 within a Negator cell would count as -5).

Cages in the grid are either KILLER cages within which cells must sum to the number in the top-left corner (if given);
and/or LOOK-AND-SAY cages that read as a "look and say" indicating which values are in the cage (e.g. if the cage is clued as 21, there must be exactly two valid 1 values in the cage along with any combination of other values).

The dashed red MAD FOLD-IN lines are folded onto each other so that column 1-2 and 8-9 form a 4x9 grid.
Arrows and cages must also be valid in the folded grid.

A cage may have a different identity depending on whether the grid is folded. Digits may repeat in cages if allowed by other rules.
The grid is partially covered in FOG; placing correct digits will clear the fog from the surrounding area.

Digits at the bottom of the grid have been provided for tracking purposes.

---

---

If you're curious about the Mad Fold-In rule, here are some puzzles from other setters using the same constraint:
"Mad Arrows" by gdc
"Joined Peas" by ChinStrap

...and the wonderful "A Tribute to Al Jaffee" by Gnubeutel, the creator of the rule.

Have fun!

---