Fillomino rules

Rules

Fillomino rules: Divide the grid into regions, such that two regions sharing an edge do not have the same size. Numbers indicate the size of the region it is located in. Regions can contain none, one, or several given numbers.

Example

Here is an example of a Fillomino grid and its solution

Fillomino example grid

Solve online here

History of Fillomino

According to the WPC unofficial wiki and GMPuzzles, Fillomino appeared first in Nikoli in 1994.