みんなの脳内ワールド (Minna no Nōnai Wārudo) is an iPhone game developed by Ryuji Kuwaki. This free game allows you to visualize the world inside your head. With this app, you can explore your own unique inner world.

The game also offers the ability to view the brain worlds of others. By using the communication feature, you can discover the diverse inner worlds of different people.

To play, simply touch the eggs and answer the questions that appear. When you answer all 100 questions correctly, characters will appear in your world, bringing it to life.

Each completed world is assigned an ID, which can be accessed by pressing the camera button on the finished world screen. You can then share your ID along with a screenshot via social media or email.