I came across these puzzles over at zotmeister’s blog. He calls them polyominous. The puzzle consists of a grid of dots with numbers sitting between some sets of four dots, not unlike slither link. But the rules, of course, are very different. Each number n sits on a polyomino made up of n cells (e.g. a 4 sits on a polyomino made up of four cells.) No two polyominoes of the same size will be orthagonally adjacent and the entire grid must be filled. To get a better idea, check out the puzzles on zotmeister’s blog.
they’re just like these puzzles:
http://www.janko.at/Raetsel/Fillomino/index.htm