Fill-in-the-blank calculation

This app is a game that answers the fill-in-the-blank calculation question one after another.
Let's answer the falling question by the time it falls down.
Questions that could not be answered correctly are piled up, and the time to answer the question will be shortened.
Not only the ability to calculate, but also the ability to judge how to derive an answer is required.

[Features]
- Simple operation by pressing the number or symbol button and then the decision button
- 2 modes, "Normal" to challenge up to 100 questions and "Speedrun" to challenge the speed of answering 30 questions
- 3 levels of difficulty (Easy / Medium / Hard)
- Supports dark mode

Let's do a quick brain training in your free time.
The difficulty level "Hard" may be very difficult, but please try it.