private void makeSandRandom() {

	for (int i = 0; i < mapWidth; i++) {

	    for (int k = 0; k < mapHeight; k++) {

		if (map[i][k] == Tile.sand) {
		    boolean generateTile = new Random().nextBoolean();
		    if (generateTile)
			map[i][k] = Tile.sand2;
		}
	    }

	}

    }