public class GenerateMap : MonoBehaviour
{
    public GameObject[] Blocks;
    void Start()
    {
        for (int i = 0; i < 20; i++)
        {
            for (int j = 0; j < 20; j++)
            {
                float Zed = Blocks[0].transform.position.z + j;
                Instantiate(Blocks[0], new Vector3(Blocks[0].transform.position.x + i, Blocks[0].transform.position.y, Zed), new Quaternion(0, 0, 0, 0));
            }
        }
        for (float a = 0; a < 20; a++)
        {
            float DownY = Blocks[1].transform.position.y - a - 1;
            for (int i = 0; i < 20; i++)
            {
                for (int j = 0; j < 20; j++)
                {
                    float Zed = Blocks[1].transform.position.z + j;
                    Instantiate(Blocks[1], new Vector3(Blocks[1].transform.position.x + i, DownY, Zed), new Quaternion(0, 0, 0, 0));
                }
            }
        }
    }
}