15-puzzle.md

Few bonus inputs (randomized by rows^(rows-1) moves)

5: {"puzzle":[[2,5,13,11,17],[20,3,-1,12,7],[24,22,9,14,1],[10,15,18,21,4],[16,8,23,6,19]]}
5: {"puzzle":[[2,24,3,18,14],[16,7,8,17,15],[4,13,11,21,1],[12,23,9,6,10],[19,-1,22,5,20]]}

6: {"puzzle":[[29,24,28,34,35,21],[1,7,20,31,22,-1],[18,17,9,25,23,19],[6,30,8,3,32,13],[27,2,15,4,10,26],[5,33,12,14,16,11]]}
6: {"puzzle":[[11,1,7,8,33,4],[3,19,26,9,25,16],[20,23,24,34,32,14],[31,21,35,27,5,-1],[30,6,15,2,29,28],[12,22,17,10,13,18]]}

7: {"puzzle":[[6,20,1,38,37,24,47],[10,8,19,25,2,13,16],[32,48,21,22,17,46,41],[34,28,43,23,3,42,26],[39,44,36,11,33,9,27],[5,30,-1,35,15,31,12],[7,29,45,4,18,40,14]]}
7: {"puzzle":[[33,30,11,31,21,-1,38],[4,2,8,24,34,48,14],[45,28,44,25,47,12,7],[27,40,35,5,9,41,29],[37,32,43,39,36,18,17],[3,20,46,26,42,13,19],[16,22,15,23,1,6,10]]}

8: {"puzzle":[[36,27,18,30,45,53,25,4],[55,39,24,17,59,3,57,62],[48,51,35,44,19,63,16,32],[6,52,49,11,22,26,34,10],[5,9,33,1,23,43,7,13],[46,42,38,28,47,61,12,50],[29,8,56,37,40,31,58,54],[60,-1,21,14,2,41,15,20]]}
8: {"puzzle":[[52,45,25,55,9,32,-1,61],[48,14,36,7,20,39,54,33],[27,47,63,23,8,49,46,43],[4,41,50,19,18,22,37,26],[2,15,57,21,44,11,28,60],[1,31,6,13,42,53,59,56],[34,35,10,17,12,3,30,16],[5,29,40,62,51,58,38,24]]}

9: {"puzzle":[[52,-1,35,24,9,8,40,31,78],[30,33,60,18,42,63,36,51,26],[80,56,14,17,79,58,38,7,15],[16,73,41,47,43,4,50,70,55],[46,12,77,37,72,75,2,1,3],[32,10,22,66,19,74,69,62,6],[20,65,45,67,53,48,21,34,44],[5,11,23,76,71,68,28,57,64],[54,39,61,25,49,29,27,13,59]]}
9: {"puzzle":[[1,74,4,29,55,11,59,65,34],[45,19,2,16,36,37,54,3,6],[23,72,32,-1,48,15,28,46,60],[26,64,80,7,5,8,42,69,27],[61,43,78,10,35,44,18,79,12],[67,62,63,53,52,30,39,56,50],[76,24,73,38,33,41,49,14,9],[31,13,22,58,57,21,40,66,68],[70,20,25,47,75,71,17,51,77]]}