One By One: Mental Math

This is a wonderful app and great opportunity for practicing mental math. And this is why I care enough to make a bug report. Please fix calculus. Some of the answers require infinity, and this is not allowed in the answers. For example, I recently got the question: Given h(x) = 8/x find h’(0). The answer is -∞ as this is the limit from the left and right hand sides, but this is impossible to enter with the ‘Differential Departments’ keyboard. One possible stopgap solution would be to make the correct answers available if you pay for a skip (with in-game currency), this way we users can figure out what the game wants in such strange situations. Alternatively, you could take away the questions generating these issues, possibly by plugging all differentiation questions into the Wolfram engine to check the outcomes and then deleting the ones that don’t match. Of course, this won’t work if the questions are auto generated and not drawn from a bank —unless you run all possible questions (which would probably take a long time).

My free time is so much more productive with this fun app! The way that the problem streaks are timed makes it exciting and the currency system feels rewarding. Using this app is just as fun as other puzzle games but instead of mindless puzzles, it helps you develop practical knowledge! The user interface is also really well done, stable, and easy to use. I reccomended this app to anyone trying to improve their quick math skills! The only gripe that I have is that there isn't an 'explanation' section in the app to refresh my memory on how to do some of these problems. But other than that the app is perfect for math lovers! You won't regret downloading it, especially if you love math! 😄

Long story short, this is one of the best math games I have ever played. You wouldn’t think it would be fun; after all, the problems aren’t disguised at all. However, with the fact that there are “golden” problems that give you artifacts and that there’s a “money” counter that goes up as you solve, it always keeps you coming back for more. I also appreciate the “Battle” Mode. However, I have two suggestions: make the “average time taken on arithmetic/algebra/trig/differential problems” display a “rolling average,” which excludes earlier problems. For example, only consider the times of the last 250 problems or so for the average. Since the point of this app is to get faster and better, a rolling average makes sense since after solving enough problems, it won’t matter how fast or slow you are, your average won’t budge since there’s so much data. It would help measure improvement and trends, showing how far you’ve come instead of reminding you of the past. It would also help refine precision for the battle mode, making sure you’re always being challenged no matter how good you are since you first started. Also, I’m over halfway done with collecting all the artifacts, and it’s worrying me about what I’ll do once I’ve found them all. For me, a big part of the game is the constant waiting for a golden problem. So, instead of having to add more artifacts, why not allow for duplicates once you’ve found them all? These duplicates would show as a simple number in the bottom-left corner of the artifact tile, and every duplicate you get would “upgrade” the artifact, making it more powerful. The boost wouldn’t have to be too big, but it would keep the thrill of golden problems after getting all of the artifacts. (More artifacts would not go unappreciated though.) However, One By One is a great app for anyone looking for a fun and fast way to improve their math skills, and it has problems for all ages: for a five-year old practicing addition, a fourteen-year old brushing up on algebra, or for a high-school student studying for their Trig or differentials final.