Hi, Most digital Kakuro games have two modes - pen and pencil. In pencil mode you list which numbers a square could possibly be, and all of those selected are drawn in a grid in the square. Filling in nearby squares you eliminate possibilities in the square you started in, until only one remains, and you can pen it in with a definitive answer. As far as I can tell you can't do this in your game, which is a terrible shame because it makes it vastly harder (approaching impossible with larger puzzles). Am I...