Dissect the diagram into areas and write a number in every field. The numbers in one area have to be the same and have to tell the number of fields in that area. Areas of same size my not touch horizontally or vertically, but diagonally.
Given numbers may belong to the same area, and it's possible that there are areas, where no number is given - even with larger numbers than the ones shown.
Fillomino is a Nikoli puzzle type.