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!
                                             
     29325554536065     
     28                         64     
     27                         63     
     26                         46     
     25                         45     
     24                         44     
     23221514817877     
                                             
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41     51     75     77     81
     43     53     73     79     
39                                   17
     45                         19     
37                                   15
     35                         21     
1                                   13
     31     29     25     23     
3     5     7     9     11
                                             
     5424146595857     
     6                         56     
     7                         53     
     22                         52     
     21                         79     
     18                         78     
     17162730757677     
                                             
3     43     45     61     63
     5     41     59     57     
1                                   65
     7                         53     
9                                   67
     21                         79     
11                                   69
     17     27     75     77     
13     15     29     73     71
                                             
     7370676543     
     74                         2     
     75                         1     
     76                         48     
     19                         49     
     18                         50     
     25262932373651     
                                             
9     81     79     75     67
     7     5     77     69     
11                                   65
     29                         71     
13                                   63
     27                         61     
15                                   59
     19     23     45     57     
17     21     43     53     55
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