Jigsawdoku or Jigsaw Sudoku is a modified Sudoku variant. You can choose diferent levels and layouts. They are what makes Jigsaw Sudoku even more fun and sometimes challenging. There are still rows and columns but instead of blocks the color is the third dimension. So in each color the numbers from 1 to 9 have to appear as well. So enjoy our free online Sudoku Jigsaw!