Study Math from Arithmetic to Calculus and uncover hidden artifacts to use as upgrades with streaks and skips to help you!

One By One is a math study game directed for middle and high school students who want some extra practice. Teenagers finally have a modern and refreshing app to practice even calculus, forever! That is right problems are randomly generated so you will always be getting different problems and working those brain muscles! Step your mental math game up to the next level!


UNICODE/ASCII Art Style. This app was designed to mimic the "nostalgic" or retro feeling on calculators with ASCII art and simple design. The background music continues this feeling with the satisfying key clicks.

A leveling system. Go from level 1 to 99 by solving problems each step of the way! Every ten levels you unlock a brand new set of mathematical questions to help study.

ARITHMETIC. Whether you need to practice what 1+1= or what (4+3)²/(4-2)³= we got you.

ALGEBRA. As you enter into high school most students struggle with algebra, help yourself out and solve some fancy algebra equations like 3x+4=5. As you progress through the levels you can grind your way up to √(x+4)*2=6

TRIGONOMETRY. I think we can all admit that the unit circle can be tricky. Through the exp system, you can work at your own pace and master sin(0) before being overwhelmed by cot⁻¹(-1). If you are already a master of sin and cos you can blow past those problems and gain some easy in-game money! For those of you who struggle with trigonometry there's even a unit circle to help!

CALCULUS DERIVATIVES. Derivatives? That's right finally you can practice the derivative rules in any setting. The problems are perfectly tuned to be anywhere from easy mental math to slight difficult mental math. You can practice the power rule or try to figure out what the derivative of ln(2x+3) is.

LEADERBOARDS & ACHIEVEMENTS: Have a competitive personality? Well, there are now 5 new leaderboards. Each game mode has its own leaderboard and the final one is based on your balance. There is also a hidden achievement, hint you better get solving!

UPGRADES: You have a chance of encountering a "Golden Problem", solve correctly and you'll receive a math artifact that can be equipped to enhance your experience. There are 25 artifacts with 9 unique upgrades that can be used to strategize your problem-solving career!

The perfect study tool. No matter what level of math you are this app is perfect for refining your mental math in a visually pleasing retro Unicode calculator style. You can transfer from arithmetic to calculus in seconds.

What are you waiting for? Download the app and solve math faster than your teacher!

What’s New

Version 1.3.1

Artifacts were tweaked and adjustment the main update are new screenshots.

Ratings and Reviews

5.0 out of 5
12 Ratings

12 Ratings

elyse12346 ,

This math practice game is so fun

I love the variety of practice questions on each level, and how the next level is unlocked once you have practiced the previous level until you really know the material

Developer Response ,

Thank you! I have plans to add more options for studying, I’m glad you appreciated the leveling system!

Papakauffed200 ,

One By One

One of the most interactive and understandable math arithmetic games I have ever played. The game is increasingly complex as one dives into the rewards system and high level mathematics, giving it an elite level of professionalism. Fun to play, helped me learn. 5 Stars.

Developer Response ,

Thank you for the review! I’m glad you enjoyed the leveling system that made studying math a bit more approachable and hopefully fun.

Mediocr ,


Interesting game that has helped me with my quick math skills!

Developer Response ,

Thank you! I tried to design the game to help with relatively quick mental math.

App Privacy

The developer, Brice Brown, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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