Great game, poor control system

I really love playing these games on the computer and thought Id try on mobile. I was happy to find so many puzzles, but very disappointed in the controls. When I tap any given square, I want that square to be coloured, not the one highlighted by the ruler. Its annoying to have to physically move the ruler for every square/row/column. Even just an option to disable the ruler and tap wherever I want wouldve made this a 5 star review

Peppysgirl about Pic-a-Pix: Nonogram Color, v3.1