A Classic Sliding Puzzle

Classic tile-sliding puzzle where your goal is to arrange the numbered tiles from 1 to 15 in order, with the empty space in the bottom-right corner. This is very old game, apparently dating back to 1870s, and was very popular in the U.S. in 1880s. Let's call it retro game. 😅

This game generates only solvable puzzles. Give it a try and challenge yourself!