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!
                                             
     41403948757069     
     2                         68     
     7                         67     
     6                         56     
     19                         57     
     18                         58     
     17162332312859     
                                             
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25     51     53     61     81
     27     43     55     63     
23                                   79
     29                         65     
21                                   77
     31                         67     
19                                   75
     15     11     5     69     
17     13     7     71     73
                                             
     69727578535249     
     70                         50     
     63                         11     
     26                         10     
     25                         9     
     24                         8     
     1234567     
                                             
25     51     53     61     81
     27     43     55     63     
23                                   79
     29                         65     
21                                   77
     31                         67     
19                                   75
     15     11     5     69     
17     13     7     71     73
                                             
     35382120435049     
     36                         48     
     27                         81     
     28                         80     
     9                         77     
     10                         76     
     126966657475     
                                             
5     1     65     69     73
     3     63     67     71     
7                                   75
     25                         51     
9                                   77
     23                         49     
11                                   79
     19     17     41     47     
13     15     39     45     81
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