Fillomino by Grant Fikes
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: Reciprocity
Author/Opus: This is the 334th puzzle from our contributing puzzlemaster Grant Fikes.
Rules: Standard Fillomino rules.
Difficulty: 2 stars
Time Standards (highlight to view): Grandmaster = 1:00, Master = 2:00, Expert = 4:00
Solution: PDF
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.
Penpa: [EDIT: Removed as we added our own official link to post]