Complete the Square Grid!

Logic Level 2

In the diagram given above, the numbers from 1 to 25 are to arranged in a $$5 \times 5$$ square grid so that each number except 1 and 2, is the sum of two of its neighbours. Some of the numbers have already been filled in. Which number must replace the " $$?$$ " when the grid is complete.

Note - Numbers in the grid are neighbours if their squares touch along a side or at a corner. For example: the number "1" has eight neighbours, the number "21" has three neighbours.

Bonus - Complete the Grid.

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