Has a big flaw
The game is really good but has a big flaw. I studied many resources and there is actually a way that makes this game unsolvable. many times when this app scrambles the puzzle it actually makes it unsolvable.
Not enough ratings yet to assess 15 puzzle.
15 puzzle - Number Sliding Puzzle appears to be a legitimate app. AppsHunter Legitimacy Score for 15 puzzle is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.