Enclosure
(Published on 15. November 2025, 13:42 by damasosos92)
Rules:
Pento loop: Place all the twelve pentominos in the grid exactly once (including rotations and reflections), creating a closed ring. Every pentomino must be connected to exactly two different other pentominos in the ring. Two connected pentominos can only touch in a single edge.
The pentomino ring divides the grid into three different regions made of orthogonally connected cells: the ring region, the central region and the outer region.
Numbers in the grid have different meanings depending on where they are:
- if they are part of the central region, they act as cave clues, counting the total number of cells that can be seen in that region from the clue in a straight line vertically or horizontally, including itself.
- if they are part of the ring region, they count the number of pentomino edges drawn surrounding the clue.
- if they are part of the outer region, they count the total number of pentomino edges that can be seen from the clue in a straight line vertically or horizontally.
An example of the ruleset with tetrominoes is provided in the image below:
Have fun solving and please leave a comment after your solve!
Solution code: Row 5, from left to right (14 letters): put the letter O for a cell in the outer region, the letter R for a cell in the ring region and the letter C for a cell in the central region. Es: OOORCCRCRROOOR
Comments
on 15. November 2025, 17:41 by yttrio
Very cool ruleset, and a great entry for the round!
on 15. November 2025, 17:03 by Christounet
Excellent puzzle, with an original ruleset that leads to very unique deductions. Some deductions require a visualisation of the connectivity that is quite hard but fair. One of my prefered of this round. Thanks :)
on 15. November 2025, 13:51 by Agent
A one-of-a-kind puzzle, ery challenging and with some very distinctive deductions!
