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!
                                             
     322354576063     
     4                         64     
     5                         65     
     6                         66     
     7                         67     
     8                         68     
     9303342457069     
                                             
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59     63     71     73     81
     61     65     41     75     
57                                   79
     55                         77     
9                                   29
     11                         31     
7                                   27
     13     1     19     33     
5     3     21     23     25
                                             
     5343742414649     
     6                         48     
     7                         81     
     22                         80     
     21                         79     
     16                         76     
     15666768737475     
                                             
37     39     81     79     65
     35     41     77     67     
19                                   63
     21                         69     
17                                   61
     23                         71     
15                                   59
     13     7     49     55     
11     9     5     51     57
                                             
     5343742414649     
     6                         48     
     7                         81     
     22                         80     
     21                         79     
     16                         76     
     15666768737475     
                                             
15     17     53     55     79
     13     51     45     77     
11                                   81
     21                         75     
9                                   73
     1                         71     
7                                   69
     3     37     31     67     
5     27     29     63     65
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