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!
                                             
     21268178777473     
     20                         54     
     17                         55     
     2                         56     
     3                         57     
     12                         58     
     11104146456059     
                                             
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37     39     59     61     69
     33     41     57     67     
35                                   71
     29                         65     
27                                   73
     25                         3     
23                                   75
     19     13     9     81     
17     15     11     79     77
                                             
     15206770717481     
     14                         76     
     11                         59     
     10                         60     
     1                         49     
     2                         50     
     3263130434651     
                                             
17     19     69     71     75
     15     67     61     73     
13                                   77
     11                         55     
9                                   79
     1                         53     
7                                   81
     3     37     31     51     
5     27     29     47     49
                                             
     43444778777671     
     38                         72     
     11                         73     
     12                         54     
     13                         55     
     2                         56     
     3201926255857     
                                             
17     19     55     81     77
     1     53     57     79     
15                                   75
     3                         67     
13                                   73
     5                         69     
11                                   71
     7     31     35     41     
9     27     29     37     39
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