Introduction
An app developed by a father raising a child. It was thought that the closeness of smartphones and tablets to children was inevitable in this day and age, but I had a deep sense of skepticism that the games, learning apps that children play were indiscriminately filled with advertisements for sexual content, violence, gambling, etc., and that it was not an environment that children could use.
So, we launched the Arithmetic Exploration Team to create an ad-free learning and game app and provide a safe environment for children to enjoy.

Functions

1. Arithmetic learning
- You can learn the vertical calculation process along with intuitive understanding through characters step by step.

2. Fingerprint reading function
- It provides a function to read fingerprints by utilizing the TTS (Text To Speech) function built into Android.
※ It may not be supported on some devices, and it is disabled by default, so you can use it by setting it in the settings window.

3. Random problem generation
- It generates random problems with a difficulty level that matches the learning stage to help with repeated learning.

4. Problem Solving Note (Notepad)
- Provides a learning note function that allows you to take notes to solve problems.

5. Learning Evaluation (Solving Time and Correct Answer Rate Statistics)
- You can evaluate learning performance by recording problem solving time and correct answer rate.

6. Game Linkage - (Free: Daily/2 times limited, Paid: Daily number of times can be set)
- You can play games with coins obtained through learning and evaluation, which encourages autonomous learning.

1) Earth Making (Watermelon Making): Match-Merge Game
2) Space Exploration (Airplane Game): Roguelike Twin Stick Shooting Game
3) Square Square: Block Puzzle Game
4) 10Maker (Apple Game): Match Sum Puzzle

※ The main purpose of the app is learning, so to prevent excessive immersion in the game, role-playing elements are excluded, and it was developed with the goal of having an average play time of less than 10 minutes per game in a single-game format.

7. Payment System
- It is divided into free/paid depending on the coin-related settings such as the number of daily game plays.
1) Set whether to acquire coins through learning or not
2) Set the number of coins currently required
3) Set the number of coins required to run the game
4) Set the number of daily games

- There is no consumable payment system to prevent excessive payments
- To prevent children from making payments without parental consent, purchases can only be made in the settings window that can be accessed with a password.
※ It was developed with the goal of allowing all functions to be used for free.

8. Advertisement
- There are no advertisements to protect the environment that children can use due to advertisements that appear randomly, such as provocative, violent, and gambling-related advertisements, and advertisements will never be introduced in future updates.