# NumDrill - Math You Can't Stop — Sharpen Your Brain, Every Day

> Sharpen Your Brain, Every Day (iPhone/iPad app by KEN ITAKURA.)

- Source: https://appshunter.io/ios/app/numdrill-math-you-cant-stop/id6752035917 (this page in markdown: same URL + `.md`)
- Developer: [KEN ITAKURA](https://appshunter.io/developer/1673182074)
- Category: Education, Games
- Price: Free
- Age rating: 12+
- Requires: iOS 18.2 · 111 MB
- Languages: American English, Japanese
- Released: 2026-06-04
- Data updated: 2026-07-18
- User reviews in markdown: https://appshunter.io/ios/app/numdrill-math-you-cant-stop/id6752035917/reviews.md

## What is NumDrill?

Can you still calculate a tip, split a bill, or work out a percentage in your head?

Every time you reach for a calculator or ask AI, your mental math skills quietly fade. The good news: they come back fast with regular practice.

NumDrill is a focused mental math drill app designed for short, satisfying sessions. Instead of mindless scrolling or another mobile game, sharpen the brain you already have.

■ Who it's for
· Anyone whose mental math has gotten rusty from over-relying on calculators or AI
· Students preparing for exams or standardized tests
· Professionals who want to stay mentally sharp
· Anyone who suspects they're wasting time on games but keeps playing anyway

■ 10 Problem Categories
- Arithmetic (addition, subtraction, multiplication, division — customize digits & decimals)
- Quadratic expressions (factoring & expansion)
- Trigonometry (sin / cos / tan values)
- Square roots
- Logarithms & Exponents
- Ratio & Percentage (everyday percentage calculations)
- Make10 / Make24 (card-based number puzzles)
- Memory (memorize and recall grids of numbers & icons)
- Mastermind (deduce a hidden number sequence with logic)
- Calculator mode (Practice mental arithmetic using calculation patterns you frequently use in everyday life)

■ 3 Play Modes
- Count / Timed / Endless

■ Features that keep you coming back
- Streaks / Combos / XP / Global Leaderboards / Social Share

■ Customizable
- Difficulty / Advance rules / Sound & Vibration

Your brain is a muscle. Five minutes a day is all it takes.
Open NumDrill.


## Version history (last 3 releases)

### 1.1.0 — 2026-07-04

■ New category: Mastermind
Crack the hidden number sequence in this classic code-breaking game. Solve it in as few guesses as you can and put your logic to the test.

■ Daily Challenge
Complete daily quests to earn bonus XP, with extra rewards the longer you keep your streak going.

■ Play reminders
Get a notification at the time you choose to keep your streak alive.

■ First-launch tutorial
New players get a quick guide to the controls — replay it anytime from Settings.

■ More improvements
- Redesigned dial-lock UI for arithmetic settings
- Countdown to the next ranking aggregation
- Your answer and a report button on the answer dialog
- Improved icons and scoring for the Memory category
- Bug fixes and stability improvements

### 1.0.1 — 2026-06-05

■ Four New Problem Categories Added!
* Memory — Memorize and recall grids of numbers and icons (animals, hiragana, fruits, etc.). A completely new drill to train your memory.
* Ratios & Percentages — Practice ratio calculations directly related to everyday life, such as "30% off" and "10% sales tax."
* Make 10 / Make 24 — A classic puzzle where you make 10 or 24 using four number cards. Enjoy it intuitively with a playing card-style design.
* Calculator Practice — A training mode where you use a real calculator to discover and correct calculation error habits.

■ Improved Statistics Screen
* Group display by problem type
* Visualize days when the streak was broken with a red X

■ Other
* Various bug fixes and stability improvements

### 1.0 — 2026-06-04

No release notes.

## More apps by KEN ITAKURA

- [Map Scope](https://appshunter.io/ios/app/map-scope/id1673182072)
- [Master Motion](https://appshunter.io/ios/app/master-motion/id6739801998)

All apps by KEN ITAKURA: https://appshunter.io/developer/1673182074

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-18.*