Four-Color Yajilominous
(Published on 19. July 2025, 04:13 by Nell Gwyn)
- Yajilin: Shade some cells gray. Gray cells cannot share an edge. Arrows indicate how many gray cells are in the indicated direction.
- Draw a single closed non-intersecting loop that moves orthogonally through every cell that is neither shaded gray nor an arrow clue.
- Arrow clue cells cannot be gray.
- Some gray cells may not be pointed to by any arrows.
- Four-Color Pentominous: Divide all non-gray cells into pentominoes.
- The cells with arrows must also be part of pentominoes (to clarify: a pentomino may have multiple arrow cells).
- Each pentomino must be one of four colors: Red, Blue, Green or Yellow (a colorblind-friendly version is included that replaces these with the letters A, B, C and D).
- No two pentominoes with the same shape (including rotations and reflections) or the same color (or both) can share an edge.
- The Yajilin loop must visit each pentomino exactly once.
Solving links (no solution embedded):
Solution code: Column 3, from top to bottom, with "A" for red, "B" for blue, "C" for green, "D" for yellow, and "E" for gray cells.
Comments
on 22. July 2025, 04:54 by Nell Gwyn
I added a clarification in the rules that the cells with arrow clues cannot be shaded gray.
Ich habe in den Regeln eine Klarstellung hinzugefügt, dass die Zellen mit Pfeilhinweisen nicht grau schattiert werden können.
on 21. July 2025, 17:01 by MaizeGator
very fun and natural ruleset. I thought the arrows being part of pentominoes was strange at first, but quickly internalized and appreciated this wrinkle.
on 20. July 2025, 09:54 by Torvelo
Can arrow cells be shaded?
on 20. July 2025, 00:57 by Agent
Great hybrid and very fun solve!
on 19. July 2025, 11:29 by Piatato
Great fun, thanks! :D
on 19. July 2025, 06:58 by Nell Gwyn
I fixed a missing clue in one of the Sudokupad links. All other versions unchanged.
on 19. July 2025, 05:59 by h5663454
The link to SudokuPad (Letter version) is missing a letter in r11c15
