From Russia with love, not just fun. Smart choice of grid dimensions, nice unpretentious retro graphics with no 'bling-bling', no ads, no in-app purchases, no devious permission requests, no self-promotions, various modes of gameplay and intuitive controls make this one a real gem. You won't be breaking any records here, but who would even want to try on a touch screen device. It's perfect as is, so buy the extended version if you want to donate.
Excellent Excellent way to kill time and exercise your mind.
Good job. I love it.