That's right, it's the su-fucking-doku thread, obviously! Who will be the first to complete it?
+-----------------+
| | 2 | 5 |
| | 4| 7 8|
|8 5 | 3|2 9 |
|-----+-----+-----|
| | 4 9| 3|
| 9| |5 |
|3 |5 7 | |
|-----+-----+-----|
| 4 6|3 | 8 2|
|9 2 |1 | |
| 1 | 8 | |
+-----------------+
Can't be bothered to format it any better than that, so you'll have to make do. Good luck!