Fillomino (Restriction) by Takeya Saikachi
or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between a composite mode for line/edge drawing and a number entry mode.)
Theme: Surrounded
Author/Opus: This is the 5th puzzle from guest contributor Takeya Saikachi.
Rules: Variation of Fillomino. The size of all polyominoes must be 1, 2, or 3.
Difficulty: 2.5 stars
Time Standards (highlight to view): Grandmaster = 2:30, Master = 3:45, Expert = 7:30
Solution: PDF; a solution video is also available here.
Note: Follow this link for classic Fillomino and this link for Fillomino variations. If you are new to this puzzle type, here are our easiest Fillomino puzzles to get started on. More Fillomino puzzles can be found in The Art of Puzzles, in Fill o’ Fillomino and Fill o’ Fillomino 2 by Grant Fikes, and in our beginner-friendly books Logic Puzzles 101 and Starter Pack 1: Fillomino.
got stuck midway … solved it through bifurcation … have to see the video solution for clean logic
Super cool finish!
Title should be fixed to ‘Fillomino (Trinudo)’
https://www.gmpuzzles.com/blog/2014/12/fillomino-trinudo-prasanna-seshadri/
Actually, I should probably change the old post from Prasanna to this new “Restriction” name. We had a discussion saying these neologisms that are not really descriptive are bad and made a conscious choice not to use “Trinudo” this time. There is a lot more possibility within the restricted digit space than just 1, 2, 3 but everything should fall under Fillomino on this site for this genre.