All initially empty squares must contain either a vertical or horizontal line. Click to toggle. The numbers should correspond to the sum of squares connected by lines to that square. Click the (?) to view in-game instructions and example. Winning times are saved to the cloud. The cool thing about these types of puzzles, is that the answer can't be found by looking inside the project. The grid is verified by accordance to rules, not a correct grid stored in the project. All code by me (@kriblo). Puzzle is from a book page I took a photo of once, but I don't know the name of the author or the book.
