The daily jigsaw puzzles are updated four times a day: 00:00, 12:00, 16:00, and 20:00. Besides playing the puzzle of the moment, you can play the last eleven ones before it.
Photo by nomao saeki / Unsplash
The image below is how the completed puzzle should look like. If you want a challenge, disable the background image (when starting a new game) and refer to this image only if needed.