public void placeFood(int amount) {
		Random rand = new Random();
		for (int i = 0; i < amount; i++) {
			int x, y;
			do {
				x = rand.nextInt(gridSize);
				y = rand.nextInt(gridSize);
			} while (getSlot(x, y) != Slot.EMPTY);
			setSlot(x, y, Slot.FOOD);
		}
	}