Number of rows, columns:
These define the size of your game field.

Difficulty:
That's the number of random moves from the finished puzzle to the version you will start with.
You can change the value through the slider or buttons.

How to play:
Press a tile next to the empty/black 'menu'-tile and they will swap their positions.

If you want to resume to the menu press the 'menu'-tile.


As Wikipedia describes:
"A sliding puzzle, sliding block puzzle, or sliding tile puzzle is a combination puzzle that challenges a player to slide (frequently flat) pieces along certain routes (usually on a board) to establish a certain end-configuration. The pieces to be moved may consist of simple shapes, or they may be imprinted with colors, patterns, sections of a larger picture (like a jigsaw puzzle), numbers, or letters."