The art is interesting to color in, and for most of the pictures there is no problem. But a subset of pictures are locked. You either have to watch video ads every time you open them, or pay $1.99 to remove the ads. Which I would be okay with, if only it worked.
I paid the $1.99 a while back. I was able to complete one locked image without ads. Then the next time I looked the locks and ads were back again. So I went into settings and hit ‘restore purchase’. Which worked once. Every time I have tried since then, it tells me that my purchase was successfully restored, yet the locks and the ads never go away.
So seriously, if you don’t mind ads this is a great app. If you do mind ads do not bother.