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!
                                             
     19222528318075     
     20                         76     
     3                         77     
     4                         60     
     5                         61     
     6                         62     
     7463938535263     
                                             
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29     31     81     79     75
     23     33     45     77     
27                                   73
     25                         71     
17                                   59
     15                         61     
1                                   57
     3     11     51     63     
5     7     9     53     55
                                             
     23223344457877     
     24                         70     
     25                         71     
     18                         60     
     15                         61     
     2                         62     
     3121110516463     
                                             
5     39     81     79     77
     7     41     43     71     
3                                   75
     9                         73     
1                                   63
     11                         65     
13                                   61
     17     25     51     57     
15     21     23     53     59
                                             
     1444342415075     
     30                         76     
     29                         77     
     28                         78     
     27                         79     
     26                         66     
     25241918176065     
                                             
67     73     81     53     47
     69     75     55     49     
65                                   45
     63                         7     
17                                   43
     15                         5     
19                                   41
     25     29     33     37     
21     23     31     35     39
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