Rules: Fill the grid with digits 1-6/1-n and divide the grid into some regions, so that each digit appears exactly once in every row, column and region. All points where three lines meet are given. There are no points where four lines meet.
Background: Same as Snail Sudoku, I developed/invented this puzzle for 4th WSC. As I remember correctly, I was inspired by Olga’s Areas puzzle. I remember the question I asked myself: “Why don’t all areas have the same amount of cells, and all digits are placed exactly once?” I used it first time for TLSCBWSC. After that for OAPC 5, and OAPC 10 (Best of OAPC, as a part of 18th WPC), 10th 24 HPC, TST 2009 (Turkish Sudoku Team Selection) etc. This puzzle was used in 6th WSC, again if I know correctly Zoltan Horvath made them. Also you can find some in Zoltan’s Sudoku blog, Studiogiochi – for more Giulia’s challenge, Andrey’s Christmas Contest etc.