private void makeGrassRandom() {

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

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

		if (map[i][k] == Tile.grass) {
		    boolean generateTile = new Random().nextBoolean();
		    if (generateTile)
			map[i][k] = Tile.grass2;
		}

	    }

	}

    }