public CreatureCommand Act(int x, int y)
        {
            var diggersLocation = FindDigger();
            if (diggersLocation != null)
            {
                var deltaX = Math.Sign(diggersLocation.Item1 - x);
                var deltaY = Math.Sign(diggersLocation.Item2 - y);
                if (deltaX != 0 && CanMove(x + deltaX, y))
                    return new CreatureCommand { DeltaX = deltaX };
                if (deltaY != 0 && CanMove(x, y + deltaY))
                    return new CreatureCommand { DeltaY = deltaY };
            }
            return new CreatureCommand();
        }

		public bool CanMove(int x, int y)
		{
			return !(Game.Map[x, y] is Terrain
                    || Game.Map[x, y] is Monster
                    || Game.Map[x, y] is Sack);
		}

        public Tuple<int, int> FindDigger()
        {
            for (var x = 0; x < Game.MapWidth; x++)
                for (var y = 0; y < Game.MapHeight; y++)
                {
                    if (Game.Map[x, y] is Player)
                    {
                        return Tuple.Create(x, y);
                    }
                }
            return null;
        }