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!
                                             
     33324368717275     
     34                         76     
     35                         77     
     26                         78     
     27                         55     
     18                         54     
     19164950515253     
                                             
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81     77     75     73     69
     79     5     3     71     
11                                   67
     9                         55     
13                                   65
     21                         57     
15                                   63
     19     29     45     59     
17     27     41     43     61
                                             
     21245352578079     
     20                         62     
     19                         63     
     18                         64     
     17                         65     
     14                         66     
     13123134353867     
                                             
21     23     37     73     77
     19     35     71     75     
17                                   79
     15                         61     
13                                   81
     11                         59     
9                                   57
     1     3     47     55     
7     5     45     51     53
                                             
     218570697479     
     20                         76     
     19                         55     
     18                         56     
     17                         57     
     16                         46     
     15143736414447     
                                             
31     35     45     81     79
     33     37     47     77     
29                                   63
     25                         65     
23                                   61
     5                         67     
7                                   59
     1     15     53     69     
9     11     13     55     57
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