15-puzzle is a classical logical game, in which it's necessary to place all numbered tiles in order by sliding them using only one empty cell.
It is also offered variations with 3x3 and 5x5 playing fields and opportunity to load your pictures instead of common tiles.
You can also choose "Hardcore" option, which has a probability to get an unsolvable combination (known as "Sam Loyd's unsolvable 15-puzzle").
This game is simple but very addictive.
Screenshots
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