public void SelectLevel(Int32 levelId)
{
CheckPersistance();
IGameLoad gameLoad = persistance.LoadGameById(levelId);
boardSize = gameLoad.BoardSize;
obstacles = gameLoad.Obstacles.Select(Tile.FromPosition);
IEnumerable <ITile> snakeBody = gameLoad.SnakeBody.Select(Tile.FromPosition);
snake = new Snake(snakeBody);
}