bSujiko is a logic$-$based, number puzzle.

Here is a completed Sujiko $3\backslash$times $3$ grid puzzle:

The puzzle takes place on a $3\backslash$times $3$ grid with four circled number clues at the centre of each

$2\backslash$times $2$ grid part which indicate the sum of the four numbers in that $2\backslash$times $2$ grid part.

The numbers $1,2,3,4,5,6,7,8,9$ must be placed in the grid, each number in one cell,