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!
                                             
     25304544497679     
     24                         68     
     21                         69     
     20                         70     
     11                         71     
     12                         58     
     13854555659     
                                             
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33     37     43     65     67
     35     39     45     63     
31                                   69
     1                         81     
3                                   71
     21                         79     
5                                   73
     9     15     53     77     
7     11     13     55     75
                                             
     25283942494847     
     24                         46     
     23                         81     
     22                         80     
     21                         79     
     20                         78     
     11121716657677     
                                             
5     3     33     81     71
     1     31     35     73     
7                                   69
     25                         75     
9                                   67
     21                         59     
11                                   65
     17     45     53     61     
13     15     47     55     63
                                             
     333239444365     
     30                         4     
     17                         3     
     18                         2     
     19                         61     
     20                         60     
     21787974676459     
                                             
33     37     43     65     67
     35     39     45     63     
31                                   69
     1                         81     
3                                   71
     21                         79     
5                                   73
     9     15     53     77     
7     11     13     55     75
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