Too many ads
I know there is an option to buy and lose the ads but the free version has an ad running about every twenty seconds. I’d upgrade but none of the buttons, menu items, options etc are complete words on my screen because I wear glasses and have my font set a little higher. Additionally I had my NB set to 1 and even though I remembered 1 back each time it still marked me as incorrect. A bettter version would have held my attention, so to speak. None the less the concept is solid. Would have been 3 stars for app formatting that doesn’t fit screen but the ads sunk it. Any app that spends up to half the usage time running you ads ruins the user experience.