# Hexagonal Kurokuron

Kurokuron (クロクロ一ン: "black clone"), is a shading puzzle that first appeared in Puzzle Communication Nikoli issues 153-155. Identical rules apply to a hexagonal grid.

# Rules

Shade some cells such that:

1. Bold-outlined regions contain exactly two shapes, made up of contiguous groups of 1 or more shaded cells. Within a region, the two shapes must be congruent, allowing reflection and rotation.
2. A shape cannot share an edge with another shape.
3. Cells with arrows, which cannot be shaded, point to a neighboring cell, which must be shaded and part of a shape consisting of the given number of cells.

# Puzzle

• Can two arrows point to the same thing? Jun 9, 2017 at 3:39
• @boboquack yes, that is possible Jun 9, 2017 at 10:06
• I'd like to thank you for introducing me to a new kind of puzzle! This is like some combination of two of my favorite puzzle types: sudoku and picross! Jun 9, 2017 at 15:05
• @feelinferrety I hope we see more of this kind of puzzle. They're so much fun to make. I'd say it's more similar to Kurotto. Jun 9, 2017 at 17:32
• @paramesis I hadn't heard of that one either. :3 Jun 9, 2017 at 18:43

## Final grid

(red is shaded, gray is not shaded)

## Explanation (Potential spoilers!)

Note that there really is one possibility to fit two regions into the 4 region (all other ways to put two 4-shapes cause them to touch). The same applies to the 6 region in the upper left corner:

From here, I figured out that if the puzzle were to have a unique solution, then the two shapes in the 2 region had to not touch other regions as much as possible, leading to this:

From here there is only one way to fill the central 7 region, and the 6 region follows easily.

• Just beat me... Jun 9, 2017 at 2:42
• Yeah, unique solution method was easiest Jun 9, 2017 at 2:51
• I'm not crazy about uniqueness as a solving method. I'm glad it didn't replace critical parts of the solve path. Jun 9, 2017 at 10:10