Apps I have made, and build for other people.
Let's try and enjoy them.
Number Sliding Puzzle
Maybe you had also one in your childhood.
A little variance is in, be sure you know which corner is the missing tile.
3x3, 4x4, 5x5, 6x6 sizes included.
Control it with click or swipe gesture.
Customize the background color, or just leave it random.