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 There is something missing (Posted on 2005-05-13)
This popular Japanese number puzzle has just one easy rule: In every Row, every Column and every 3x3 sub-grid, all the numbers from 1 to 9 should appear, but only once in each row, column and sub-grid.
+------+-------+------+
| 0 0 0 | 7 0 0 | 4 0 0 |
| 0 3 0 | 0 9 0 | 0 2 0 |
| 4 0 0 | 0 0 5 | 0 0 0 |
+------+-------+------+
| 0 0 8 | 0 0 0 | 0 0 5 |
| 0 9 0 | 0 3 0 | 0 7 0 |
| 6 0 0 | 0 0 0 | 3 0 0 |
+------+-------+------+
| 0 0 0 | 4 0 0 | 0 0 6 |
| 0 7 0 | 0 2 0 | 0 9 0 |
| 0 0 5 | 0 0 8 | 0 0 0 |
+------+-------+------+

Replace the 0's with the digits required to satisfy the rule.

 See The Solution Submitted by Hugo Rating: 4.4000 (10 votes)

 Subject Author Date Execution in 2 seconds !!!! Penny 2005-09-25 02:13:34 re: Program execution in less than a minute Ken Haley 2005-06-04 16:30:13 Solution sassy 2005-05-22 20:17:10 re: Program execution in less than a minute Penny 2005-05-19 11:05:46 Program execution in less than a minute Penny 2005-05-18 19:53:41 Regarding the Official Solution nikki 2005-05-17 14:06:29 re: Totally by Hand pcbouhid 2005-05-17 13:32:55 Thanks... Ken Haley 2005-05-17 03:31:09 Totally by Hand nikki 2005-05-17 01:33:29 re(5): Haley's Comet vrs. Penny's Loafer: And the winner is.... Charlie 2005-05-16 14:50:46 re(4): Haley's Comet vrs. Penny's Loafer: And the winner is.... Charlie 2005-05-16 14:10:44 re(3): Haley's Comet vrs. Penny's Loafer: And the winner is.... Ken Haley 2005-05-16 06:04:04 re(4): For those who don't know... pcbouhid 2005-05-15 23:35:18 re(3): For those who don't know... Penny 2005-05-15 22:49:13 re(2): For those who don't know... pcbouhid 2005-05-15 21:30:42 re(2): Haley's Comet vrs. Penny's Loafer: And the winner is.... Charlie 2005-05-15 17:31:39 re: Haley's Comet vrs. Penny's Loafer: And the winner is.... Ken Haley 2005-05-15 15:09:25 re: For those who don't know... Hugo 2005-05-15 13:30:05 Haley's Comet vrs. Penny's Loafer: And the winner is.... Penny 2005-05-15 05:44:29 re: Thanks, Mr. Haley Ken Haley 2005-05-15 01:59:43 For those who don't know... pcbouhid 2005-05-14 21:38:32 Thanks, Mr. Haley Penny 2005-05-14 17:53:52 Solution Lisa 2005-05-14 16:35:58 re: A popular game in my neighborhood.... Ken Haley 2005-05-14 14:53:18 A popular game in my neighborhood.... Penny 2005-05-13 22:58:16 two more numbers Avin 2005-05-13 21:03:43 Computer Solution Charlie 2005-05-13 21:03:15 again... pcbouhid 2005-05-13 20:00:59 Nice problem - 2 numbers at once pcbouhid 2005-05-13 19:56:30

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