This application is a simple Japanese abacus (soroban / そろばん). It has a free mode where you can use the abacus freely and a challenge mode with 4 operations (addition subtraction one and two digit multiplication and division) and 3 difficulty levels (easy medium hard) where you must race against the clock to perform calculations.

Contains tutorials for:
* basic concepts
* addition
* subtraction
* one-digit multiplication
* two-digit multiplication
* division

Also has a custom challenge mode where you can set the number of questions type of questions and difficulty.

(This is just a hobby project I'm doing for fun. This app is free and doesn't have in-app purchases or ads).

[PERMISSIONS USAGE]
This is a description of how permissions are used in this app.
Vibrate: The application can vibrate the phone to give user feedback. This can be enabled/disabled in the Settings screen.

[PRIVACY]
This application does not collect or transmit any data. Your settings ranking and challenge times are stored locally on your phone only.
You can view the privacy policy here: http://bit.ly/simple-soroban-privacy