Everything seems to work well.
You could improve the looks a little and maybe get some music.
The Game of 15 is a sliding puzzle that consists of a frame of numbered square tiles in random order with one tile missing. The object of the puzzle is to place the tiles in order by making sliding moves that use the empty space.
PlayMarket Version: https://play.google.com/store/apps/details?id=ru.Serious07.GameOfFifteen
Everything seems to work well.
You could improve the looks a little and maybe get some music.
Easy and clean. Audio is very satisfying. You could put a option of touching the tile with a space on some side make it slide to that place.
Works fine. Would be nice if the text wasn't selectable so that the cursor stays as an arrow. Very clean!
Thx for you responce. I'll take this into account for the future!