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 5. February 2026, 00:28 by zzw
Awesome puzzle, loved it! Really cool ruleset (seeing some Richard influence here too haha). Definitely makes the most of the interactions between the rules, right from the tough but very
interesting breakin.
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!
