The classic sliding block puzzle. The 15-puzzle consists of a 4-by-4 grid with tile numbered $1$ to $15$ placed in the grid. The object of this puzzle is to randomly arrange the tiles on the grid, and ...

If you've never played 2048, I highly suggest you do. It's a addictive sliding-block puzzle-game and it's free-to-play (and I mean free, not like these games). It was so popular it received over 4 ...