Fillodoku is a fusion of Fillomino and Sudoku.
Puzzle and Goal
An unsolved puzzle consists of a square grid divided into rectangular regions. Some cells have numbers in them.
The goal is to fill some of the cells with numerals. Some cells may be empty.
The solved grid must satisfy the following conditions:
Each number n appears n times in each row, column, and region.
In each region, the numbers n form an orthogonally contiguous area.