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!
                                             
     47464552555879     
     36                         76     
     35                         75     
     34                         72     
     33                         71     
     32                         64     
     31302726171665     
                                             
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15     3     81     77     73
     13     1     79     75     
17                                   71
     11                         69     
19                                   61
     9                         53     
21                                   59
     27     31     47     55     
23     25     33     49     57
                                             
     136366657071     
     12                         52     
     11                         51     
     10                         50     
     31                         49     
     30                         48     
     29282738414447     
                                             
31     33     51     59     61
     29     35     53     57     
21                                   63
     23                         79     
19                                   65
     17                         77     
15                                   67
     11     43     5     73     
13     9     7     71     69
                                             
     25363540717479     
     26                         76     
     27                         65     
     28                         66     
     11                         61     
     12                         58     
     138548475253     
                                             
23     39     41     77     81
     25     37     43     79     
21                                   71
     27                         73     
19                                   69
     15                         65     
17                                   63
     3     9     53     57     
5     7     51     59     61
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