The 15th game of permutations (Mobile Pieces puzzle).
Mathematical problem or puzzle (of permutations), posed in 1878 by Samuel Loyd (1841–1911).
The Game of 15 application is a simple game, where we slide the tiles one by one, according to the possible movements, until we reach the final assembly, according to the chosen model.
After Mixing, move the adjacent pieces to the palm tree or empty space, until all the pieces are placed in the corresponding original order, to that established by the chosen model (Mod. 1 to 4). This application has the particularity of choosing the final model to achieve, thus providing a multiplicity of logical mixtures to start the game.