/// <summary>
        /// Joins to an existing game.
        /// </summary>
        /// <param name="mazeName">Maze name.</param>
        public void JoinGame(string mazeName)
        {
            GameRoom room = model.JoinGame(mazeName, Context.ConnectionId);

            //Parse maze to json.
            Maze    maze     = room.RoomMaze;
            JObject jsonMaze = ToJsonParser.ToJson(maze);

            //Send the maze to both players.
            Clients.Client(room.PlayerOne.ConnectionId).gotMaze(jsonMaze);
            Clients.Client(room.PlayerTwo.ConnectionId).gotMaze(jsonMaze);
        }