There are levels of difficulty to choose from that give you as much complexity as you want. The art is interesting to look at and includes enough color clues to help you solve. I find it relaxing.
Sunsea20,
Pretty Cool
this is one of the good puzzle apps that I actually like; the images aren't generic; the pieces are organized; and the ads aren't as interruptive; that's all I need
Nina Sug,
Perfect adjustable difficulty!
It’s fun and you can make it as challenging as is your mood!
I am really relaxed and occupied when I work my way through thee lovely jig saw puzzles.