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

          DIFFICULTY: 0.00