Sukoro

Sukoro is a one of pencil puzzle.
The player fill in the blank cell with suitable symbol in accordance with the following rules.

1. A number denotes how many of it's orthogonal neighboring cells are also number cells.
2. Same numbers must not be orthogonally adjacent.
3. All numbers must form a single orthogonally contiguous area.

Very simple, but deep rules.
If you like puzzle game, please try once.
You shall not be the loser by it