Need a little more improvement
This app is good. I and my mom enjoy playing it. Personally, I think it should have a combination mode other than 4 mode separately. It's challenging not to know what comes next. Please considering doing it. I'll recommend this app to my friends and patients if you do improve. Cuz I think this app is really useful and enjoyable at the same time. BTW, it will be way better to classify the player , for example, fill in the age or level of graduation before starting the game. So the player can face the level of difficulty that matches their level of mathematical skills. Looking forward to see your improvement ^____^