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!
                                             
     15182144477271     
     16                         70     
     9                         67     
     8                         66     
     5                         81     
     4                         60     
     29283534536261     
                                             
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65     67     75     19     1
     63     69     77     17     
47                                   3
     49                         15     
45                                   5
     51                         13     
43                                   7
     41     55     29     11     
39     37     35     27     9
                                             
     1204750616065     
     2                         66     
     3                         67     
     4                         68     
     5                         69     
     6                         70     
     7262932373671     
                                             
25     27     59     61     81
     23     29     57     79     
17                                   77
     19                         65     
15                                   75
     11                         67     
9                                   73
     5     35     39     69     
7     1     37     41     71
                                             
     15182144477271     
     16                         70     
     9                         67     
     8                         66     
     5                         81     
     4                         60     
     29283534536261     
                                             
61     63     65     79     81
     59     57     67     77     
23                                   75
     21                         71     
19                                   73
     17                         45     
11                                   43
     13     5     33     39     
9     7     1     35     37
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