Fillomino Puzzles - 200 Very Hard Puzzles 11x11 Book 4

Fillomino (also known as "Polyominous") is a type of logic puzzle. Fillomino is played on a rectangular grid with no standard size. Some cells of the grid start containing numbers, referred to as "givens". The goal is to divide the grid into blocks. The block must contain the number of cells indicated by the number in the cells of the block. The block cannot touch a similarly sized block, horizontally or vertically. Cells without numbers may form blocks necessary to complete the puzzle.