-------------------------------------
|           |     3   7 |     9     |
|   +   +   +   +   +   +   +   +   |
|     5     |           |     8     |
|   +   +   +   +   +   +   +   +   |
|           |     5     | 2   7   6 |
|---+---+---+---+---+---+---+---+---|
| 6   3     |           |           |
|   +   +   +   +   +   +   +   +   |
|         5 |           | 8         |
|   +   +   +   +   +   +   +   +   |
| 1         | 3   2     |           |
|---+---+---+---+---+---+---+---+---|
|           |         5 |     6     |
|   +   +   +   +   +   +   +   +   |
| 9   7     |           |           |
|   +   +   +   +   +   +   +   +   |
|     4     |     1   8 |         2 |
-------------------------------------

          DIFFICULTY: 6.00