The N-Photo is a sliding puzzle that consists of a frame of numbered square tiles in random order with one tile missed. If the size is 3×3 tiles, the puzzle looks like the 8-puzzle or 9-puzzle but with a picture, and if 4×4 tiles, the puzzle looks like the 15-puzzle or 16-puzzle named, respectively, for the number of tiles and the number of spaces. The object of the puzzle is to place the tiles in order by making sliding moves that use the empty space.

This implementation of a popular game using a picture (under CC0 if the source "Internet" chosen), which divides into pieces with a last piece missed.

How to make from the sources:
$ sudo apt-get install qtdeclarative5-dev
$ qmake client.pro
$ make

Then launch N-Photo:
$ bin/n-photo