Fortress Fillomino - Friday 13th (9x9?)
(Published on 13. February 2026, 16:45 by ThePedallingPianist)
click image to play this week's Fortress Fillomino
FORTRESS FILLOMINO:
• Divide the grid into orthogonally connected regions and fill each cell with a number (not necessarily single-digit) showing the number of cells in the region to which it belongs;
• Each region must be either strictly larger than all of its orthogonal neighbours or strictly smaller than all of its orthogonal neighbours;
• A thick black line between two cells indicates a border between neighbouring regions;
• In this puzzle, cells outside the large "13" shape are to be left empty.
LITTLE KILLERS:
• Values along an indicated diagonal sum to the given total.
Solution code: Top row (6 values), left to right
Comments
on 6. August 2026, 03:56 by MaizeGator
Loved the flow of the solution path around the grid in this one
on 29. July 2026, 04:53 by Clementi
Hi, loving these Fortress Fillomino puzzles, wonderful work.
A question about all the puzzles with the "not necessarily single-digit" rule: how should we enter two-digit numbers on sudukopad? (And how would it know if we have the right answer?)
Haven't needed to on the previous puzzles I've completed, but I figure it's only a matter of time.
---
TPP: Thanks for having a go at these puzzles and for your kind comment! One day I'll learn how to set puzzles on Penpa, where you can make two-digit numbers part of the solution check.
In the meantime, different setters throughout this FFF series have had different workarounds for two-digit numbers. Personally, I just leave those cells blank in the solution check so you can choose whether to fill them or not, but some setters require you to enter the units digit or something like that. It should be clear in the rules in any case. Hope that helps!
on 21. July 2026, 10:03 by Piatato
Sweet!
on 25. June 2026, 12:49 by Flinty
Thursday 25th (Very Nice?)
