Source: http://www.retrojatekmuzeum.hu/2015/03/butor-mihaly-fele-tili-toli-kirakok.html
The app lets you create your own custom digital version of a 15 puzzle variant that was popular in Hungary during the 80s and 90s.
Try it here: https://balazsdavid987.github.io/Sliding-Puzzle-Factory/
Choose an image, a color for the frame and another for the background, and you will get an URL on which your puzzle is available.
https://www.youtube.com/watch?v=q7US-sD0xgU
- 15 puzzle - Wikipedia https://en.wikipedia.org/wiki/15_puzzle
- 15 Puzzle -- from Wolfram MathWorld http://mathworld.wolfram.com/15Puzzle.html
- 15-Puzzle Optimal Solver http://kociemba.org/fifteen/fifteensolver.html