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.
Solution code: The 4th row
on 4. January 2023, 04:20 by TJReds
penpa link: https://tinyurl.com/2en5uuc4
(For those who may prefer penpa)
on 3. October 2022, 21:28 by Drawoon
pzv: http://pzv.jp/p.html?fillomino/8/7/g21g12n1g132h32o323i21i2g3g23h1g1h
on 24. November 2010, 13:29 by Richard
Sehr tolles Raetsel! Danke!
on 23. November 2010, 23:57 by lupo
Lustig!