/// <summary>
/// Creates the block. Using playing coord [1, +INF)
/// </summary>
/// <returns>The block.</returns>
/// <param name="x">The x coordinate.</param>
/// <param name="y">The y coordinate.</param>
/// <param name="size">Size.</param>
MapBlock CreateBlock(int x, int y, int size)
{
GameObject g = Instantiate(blockPrefab,
transform.position + new Vector3(x * unitDist, -y * unitDist, 0),
Quaternion.identity);
g.name = System.String.Format("MapBlock({0}, {1}, {2}x{2})", x, y, size);
MapBlock block = g.GetComponentInChildren <MapBlock>();
block.posX = x;
block.posY = y;
block.SetSize(size);
blocks.Add(block);
block.transform.localScale = new Vector3(unitDist, unitDist, unitDist);
block.transform.SetParent(blockParent);
return(block);
}