This is a grid math training app with handwriting input. Please use it for mental exercise.

How to use:
You can choose addition, subtraction, or multiplication.
Enter the answer by handwriting, and if it’s correct, it will automatically move to the next grid.

In the settings tab, you can set the grid size and whether you are right-handed or left-handed.
It’s easier to write if you use an Apple Pencil on an iPad.

The app is free to use for the first 3 days after installation. After the free trial period ends, the app will be locked. However, you can continue to use it by unlocking it with a purchase.

Requires iOS 17.2 or later.