Free printable Numpath puzzle game (compare to Numbrix)

Printable, reloadable, free, and always new, Numpath puzzle brain-teaser games are here. Print out this page, and play at your convenience. Simply fill in the empty squares with numbers, ending up with a "path" from number one to number eighty-one. Each number must adjoin the number before and after it, horizontally or vertically (not diagonally). Enjoy!
                                             
     17162354575861     
     14                         62     
     29                         77     
     30                         76     
     31                         67     
     8                         68     
     7343540414469     
                                             
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53     55     57     69     71
     51     49     59     67     
1                                   73
     41                         65     
3                                   75
     11                         29     
5                                   77
     9     17     25     81     
7     15     21     23     79
                                             
     47485154576265     
     36                         66     
     37                         67     
     38                         68     
     39                         69     
     6                         70     
     11122120191871     
                                             
45     49     55     63     81
     47     51     57     65     
43                                   79
     37                         67     
41                                   77
     39                         69     
7                                   75
     11     21     19     71     
9     13     15     17     73
                                             
     19222528318075     
     20                         76     
     3                         77     
     4                         60     
     5                         61     
     6                         62     
     7463938535263     
                                             
27     29     47     59     61
     13     31     49     57     
25                                   63
     15                         81     
23                                   65
     17                         79     
21                                   67
     19     5     75     77     
1     3     73     71     69
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