Assigned Pentominoes Loop #1 (14x18)
(Published on 11. February 2026, 14:00 by Playmaker6174)
The following puzzle is the first part of my next major puzzle hybrid project, which is inspired by my own Stationary Loop Decon puzzle and a series of Pentominoes Yajilin puzzles from others in the past as well. This project follows right after the temporary break of my Cavernous Jsum mini-series and its main concept is kind of a soft way to get myself more familiar with pentominoes theme.
I actually ended up with (at least) two different versions of the concept after the initial draft, the only difference till this point is the last rule, which will be highlighted bold and also colored differently over here, while the rest is essentially the same. #1 was meant to be done before the upcoming Lunar New Year holiday in my place and at the point of writing this post, #2 is still under some considerations, but I hope that I'll get to finish it before my next birthday (March 6th) ;)
For now, do enjoy the first version of it first here! This is actually a toned down version of the original result as I decided to adjust or add some clues for a cleaner transition in the middle.
Rules:
- Shade some pentominoes into the grid - i.e. regions of five orthogonally connected cells. Pentominoes cannot touch each other orthogonally but may touch each other diagonally.
- Each possible pentomino shape can only be used at most twice in the grid, including rotations and/or reflections (i.e. zero, one or two times only). This also means that not all possible pentomino shapes are necessarily used.
- Additionally, draw a single loop that goes orthogonally through all of the remaining unshaded cells and also doesn't visit any shaded pentomino. The loop cannot branch or intersect itself at any point.
- Each shaded pentomino must be 'assigned' with an integer number from the range of 1-12, and such number is written into all five cells of that pentomino. Same shaded shapes are assigned with same number while different shaded shapes are assigned with different numbers. Two of such assigned numbers have been given.
- A cell with black arrow[s] must belong to a pentomino and its assigned number is equal to the combined amount of cell borders in the indicated direction[s] that the loop goes through.
(The table below is meant for keeping track of the assigned number for each pentomino shape appearing in the grid. If a shape isn't used at the end then its assigned number is left empty)
The bank including all possible pentomino shapes can be found below:
An example image showcasing tetrominoes with assigned numbers from 1-5 range can also be found below. One can solve this example puzzle in either Penpa plus or Sudokupad.
Puzzle: Penpa plus - Sudokupad
The answer check in penpa link will activate once all following conditions are met: The loop is correctly drawn; the pentominoes are correctly shaded and their respective assigned numbers are correctly filled (both in the pentominoes and in the tracking table below).
For now, good luck and have fun solving!
I actually ended up with (at least) two different versions of the concept after the initial draft, the only difference till this point is the last rule, which will be highlighted bold and also colored differently over here, while the rest is essentially the same. #1 was meant to be done before the upcoming Lunar New Year holiday in my place and at the point of writing this post, #2 is still under some considerations, but I hope that I'll get to finish it before my next birthday (March 6th) ;)
For now, do enjoy the first version of it first here! This is actually a toned down version of the original result as I decided to adjust or add some clues for a cleaner transition in the middle.
Rules:
- Shade some pentominoes into the grid - i.e. regions of five orthogonally connected cells. Pentominoes cannot touch each other orthogonally but may touch each other diagonally.
- Each possible pentomino shape can only be used at most twice in the grid, including rotations and/or reflections (i.e. zero, one or two times only). This also means that not all possible pentomino shapes are necessarily used.
- Additionally, draw a single loop that goes orthogonally through all of the remaining unshaded cells and also doesn't visit any shaded pentomino. The loop cannot branch or intersect itself at any point.
- Each shaded pentomino must be 'assigned' with an integer number from the range of 1-12, and such number is written into all five cells of that pentomino. Same shaded shapes are assigned with same number while different shaded shapes are assigned with different numbers. Two of such assigned numbers have been given.
- A cell with black arrow[s] must belong to a pentomino and its assigned number is equal to the combined amount of cell borders in the indicated direction[s] that the loop goes through.
(The table below is meant for keeping track of the assigned number for each pentomino shape appearing in the grid. If a shape isn't used at the end then its assigned number is left empty)
The bank including all possible pentomino shapes can be found below:
An example image showcasing tetrominoes with assigned numbers from 1-5 range can also be found below. One can solve this example puzzle in either Penpa plus or Sudokupad.
Puzzle: Penpa plus - Sudokupad
The answer check in penpa link will activate once all following conditions are met: The loop is correctly drawn; the pentominoes are correctly shaded and their respective assigned numbers are correctly filled (both in the pentominoes and in the tracking table below).
For now, good luck and have fun solving!
Solution code: Enter the last row (row 14) from left to right - in case of a pentomino cell, enter its respective assigned number; in case of a loop cell, enter capital letter L if it's a loop's turn or capital letter I if it's a loop's straight segment.
Solved by Las4one, Tom-dz, h5663454, cyddrdrd, Fool on Hill, nuzzopa, Dragonslayer, CJK, zzw, dogfarts, Andrewsarchus, PuzzleJohn, SeveNateNine, TheZwierz, han233ing, itweb, MaizeGator, akodi, Mr_tn, Christounet, CutieRainbow, Jesper
Comments
on 16. February 2026, 18:41 by Christounet
Great! A lot of fun, even if I got stuck for a while in the midsolve because I forgot about the "at most twice" rule... Thanks :)
on 16. February 2026, 02:26 by MaizeGator
Absolutely loved it
on 13. February 2026, 05:32 by zzw
Very nice!!
on 11. February 2026, 19:29 by cyddrdrd
Cool puzzle!!
