public static List <Game26> GetNeighbors(Game26 current)
        {
            List <Game26> list = new List <Game26>();

            var moves = current.getMoves();

            for (int i = 0; i < moves.Count; i++)
            {
                Game26 copy = current.Copy();

                copy.moveTile(moves[i].x, moves[i].y);

                copy.finalDistance = double.PositiveInfinity;
                copy.distance      = double.PositiveInfinity;

                list.Add(copy);
            }

            return(list);
        }