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!
                                             
     57565554656871     
     48                         72     
     49                         73     
     44                         74     
     21                         75     
     22                         4     
     1514111029305     
                                             
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27     33     53     65     67
     29     35     55     63     
25                                   69
     17                         61     
23                                   71
     19                         81     
21                                   73
     1     11     9     79     
3     5     7     77     75
                                             
     75747170321     
     8                         62     
     9                         59     
     10                         48     
     11                         49     
     24                         50     
     23222120353851     
                                             
41     43     49     63     65
     37     45     51     61     
39                                   67
     3                         57     
5                                   69
     13                         79     
7                                   71
     11     23     21     77     
9     17     19     75     73
                                             
     63666776757237     
     64                         38     
     59                         39     
     56                         40     
     55                         41     
     10                         28     
     981318172227     
                                             
77     73     69     67     65
     75     71     3     1     
79                                   63
     9                         59     
81                                   57
     11                         49     
13                                   55
     23     21     35     51     
15     17     19     37     53
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