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!
                                             
     23242756556063     
     18                         62     
     15                         49     
     10                         48     
     11                         77     
     6                         76     
     5343342414075     
                                             
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27     29     53     55     73
     21     31     51     71     
25                                   75
     23                         69     
1                                   77
     3                         67     
5                                   79
     11     39     43     65     
7     9     41     63     81
                                             
     1383742535251     
     34                         50     
     33                         79     
     32                         78     
     17                         77     
     16                         68     
     15142124737067     
                                             
57     59     67     69     73
     51     61     65     71     
55                                   75
     53                         41     
21                                   77
     19                         37     
9                                   79
     11     3     29     33     
7     5     1     31     81
                                             
     21203380797667     
     22                         68     
     23                         69     
     24                         70     
     13                         71     
     14                         54     
     9876495255     
                                             
21     25     57     59     65
     23     27     55     63     
19                                   67
     15                         49     
13                                   69
     11                         77     
1                                   71
     5     33     41     75     
3     35     37     39     73
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