This quilt is based on a Sudoku puzzle and is the second one I have made. I am tying the first one now so it is taking longer. I think they are a lot of fun and I am always tempted to start another one even though I have piles of UFOs begging to be worked on. In a Sudoku quilt (or puzzle) the same single fabric (or number) may not appear twice in the same row, column or in any of the nine blocks. The first photo is the back; the second is the front of the quilt.