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!
                                             
     53525150496081     
     26                         62     
     25                         63     
     22                         64     
     21                         65     
     12                         68     
     11141736414069     
                                             
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37     41     47     75     81
     39     43     49     77     
35                                   79
     27                         67     
33                                   65
     29                         69     
31                                   63
     7     17     15     57     
9     11     13     59     61
                                             
     53525150596063     
     20                         64     
     19                         67     
     18                         68     
     17                         69     
     14                         70     
     13122942413471     
                                             
1     55     57     59     79
     53     51     49     81     
3                                   77
     25                         63     
5                                   75
     21                         65     
7                                   73
     11     17     41     69     
9     15     37     39     71
                                             
     17224342478077     
     16                         78     
     15                         71     
     12                         68     
     11                         63     
     10                         64     
     9303534536059     
                                             
1     55     57     61     81
     53     51     59     63     
3                                   79
     19                         67     
5                                   77
     17                         69     
7                                   75
     13     29     41     71     
9     11     31     33     73
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