Printable Numpath puzzle game (compare to Numbrix)

Printable, reloadable, 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!
                                             
     19245150556063     
     18                         64     
     15                         65     
     12                         66     
     11                         69     
     8                         70     
     7323142413871     
                                             
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11     5     81     79     77
     9     3     1     61     
13                                   75
     31                         63     
15                                   73
     29                         65     
17                                   71
     25     23     49     67     
19     21     45     47     69
                                             
     27263376798061     
     22                         62     
     23                         63     
     18                         64     
     15                         65     
     8                         66     
     9632476867     
                                             
1     31     67     75     77
     29     65     69     73     
3                                   79
     27                         81     
5                                   51
     23                         53     
7                                   49
     11     17     41     45     
9     13     15     43     47
                                             
     25666564637275     
     26                         74     
     27                         81     
     10                         52     
     11                         53     
     12                         54     
     13612414445     
                                             
25     81     79     77     73
     27     33     35     75     
23                                   71
     29                         59     
21                                   57
     17                         61     
19                                   55
     3     1     49     63     
5     7     9     51     53
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