* Carga el nivel actual leyendo el fichero 'level' + currentLevel + '.txt'
*/
public void loadCurrentLevel() {
FileHandle file = Gdx.files.internal("levels/level" + currentLevel + ".txt");
String levelInfo = file.readString();
int x = 0, y = Constants.SCREEN_HEIGHT - Constants.BRICK_HEIGHT;
String[] rows = levelInfo.split("\n");
Brick brick = null;
for (String row : rows) {