This is a Nikoli puzzle.
Puzzle and Goal
An unsolved puzzle consists of a rectangular grid with some numbers in it.
The goal is to create regions of 4 or 5 squares each, according to the rules.
The solved grid must satisfy the following conditions:
Clues indicate the number of sides of the square that form walls of a region.
The size of the regions (4 or 5 cells) is indicated for each puzzle.
Faibuseruzu; Foseruzu; Fuenf Felder