Ни когда не думала, что в пятнашках столько вариантов решения. Мы привыкли только к стандартному - горизонтальному:
Обзор: http://www.cs.brandeis.edu/~storer/JimPuzzles/ZPAGES/zzzFifteen.html (http://www.cs.brandeis.edu/~storer/JimPuzzles/ZPAGES/zzzFifteen.html)
(http://www.cs.brandeis.edu/~storer/JimPuzzles/SLIDE/Fifteen/FifteenThinkFunKeychainBoxBackProblems-TN.jpg)
(http://www.cs.brandeis.edu/~storer/JimPuzzles/SLIDE/Fifteen/IMP/FifteenIMPBooklet1934MB/FifteenIMPBooklet1934MBProblemsFront.jpg)
(http://www.cs.brandeis.edu/~storer/JimPuzzles/SLIDE/Fifteen/IMP/FifteenIMPBooklet1934MB/FifteenIMPBooklet1934MBProblemsBack.jpg)
(http://www.cs.brandeis.edu/~storer/JimPuzzles/SLIDE/Fifteen/OTHERS/FifteenDruekeBack.jpg)