The style of the grid and pics reminds me of where I got started years ago. I used to do these books cover to cover on deployments/training ops when i was in the military.
The name is on the top of the screenshot :P https://play.google.com/store/apps/details?id=com.mainmint.nonogramadventure&hl=en_US&gl=US
That’s also what I thought when I found them on Amazon. I haven’t done any that are so large so I don’t know if I’m ready for the challenge.