Tap the screen to mark that location. The countdown will start at the same time. If you tap the screen further, a marking position will be added and the countdown will restart. When the countdown ends, one will be selected from multiple markings.

As a hint on how to use it, it can be used to draw one person out of multiple people.
Tap and hold the screen with multiple people at the same time. One of them will be selected and the winner will be determined.

Here's how to use this app:
For example, three people tap and hold the screen area with their index fingers at the same time.
A circular pattern will appear at each tapped position.
A countdown will begin, and one of the three will be selected and highlighted in red.
The person who taps the highlighted area is the winner.
In other words, we are drawing one out of three.
A circular pattern or red circle is not a button.

Images of spaceship interiors, clouds, etc. give the lottery function a game feel.