A hidden picture is a type of a puzzle which does not let to see a preview before you start the puzzle and while you are working on it. You may encounter tasks to complete puzzles with hidden pictures in quests.

To start a puzzle with a hidden picture, tap "Play" button in the "Quests" section.

Also, you can open it via the mini-library the following way:

1. Tap "Play" at the bottom right corner

2. Tap the pictures on the left

3. Choose a picture with a puzzle piece on the orange background

4. Set the desired puzzle complexity (24/35/70/140/280/630 pieces)

5. Tap "Play".