Game F

Tag or game of 15 is a well-known game from a series of puzzles. The number 15 in the name of the game comes from the number of knuckles enclosed in a box. Each knuckle is numbered from 1 to 15. There are 16 cells in the box, one of which is not occupied by a knuckle. The box size is 4x4. The player can move the knuckles in the box at the expense of a free cell. The goal of the game is to collect the knuckles in a box with numbers in order, using as little as possible the number of moves (moves). The game is considered complete once the goal is reached.