Create grid In Unity3D

public class GridManger : MonoBehaviour
{
    [SerializeField] private int _width, _height;

    [SerializeField] private Tile _tilePreFab;
    [SerializeField] private Transform _cam;

    private Dictionary<Vector2, Tile> _tiles;

    void Start() {
        _cam.transform.position = new Vector3((float) _width / 2 - 0.5f, (float)_height / 2 - 0.5f, -10);

        GenerateGrid();
    }

    void GenerateGrid() {
        _tiles = new Dictionary<Vector2, Tile>();

        for (int x = 0; x < _width; x++) {
            for (int y = 0; y < _height; y++) {
                var spawnedTile = Instantiate(_tilePreFab, new Vector3(x,y), Quaternion.identity);
                spawnedTile.name = $"Tile {x} {y}";

                var isOffset = (x % 2 == 0 && y % 2 != 0) || (x % 2 != 0 && y % 2 == 0);
                spawnedTile.Init(isOffset);

                _tiles[new Vector2(x, y)] = spawnedTile;
            }
        }

    }

    // helper function for get grid position
    public Tile GetTileAtPosition(Vector2 pos) {
        if(_tiles.TryGetValue(pos, out var tile)) {
            return tile;
        }

        return null;
    }
}

public class Tile : MonoBehaviour
{
    [SerializeField] private Color _baseColor, _offsetColor;
    [SerializeField] private SpriteRenderer _renderer;
    [SerializeField] private GameObject _highlight;

    public void Init(bool isOffset) {
        _renderer.color = isOffset ? _offsetColor : _baseColor;
    }

    void OnMouseEnter() {
        _highlight.SetActive(true);
    }
    void OnMouseExit() {
        _highlight.SetActive(false);
    }
}