This app pixelates photos taken with the camera or other photos on your smartphone, and then asks people questions to guess what they are.

There are no pre-prepared quiz questions in this app.
This is an app that allows you to create your own quizzes using photos on your smartphone and ask them to others.

At first, the photo will have a very coarse pixelated appearance, but over time it will gradually become finer pixelated.
In the end, the photo that you selected will be displayed as without any pixelation.

I feel like I saw a quiz like this on a TV show a long time ago.

You can adjust how long it takes for the final non-pixelated photo to appear, as well as the roughness of the initial pixelation.
You can also pause the quiz while it is taking questions.

You can also save the pixelated version of your photo as a separate photo file.