// BEGIN CHANGED
private int c;

public BlusterCritter(int c) {
  this.c = c;
}
// END CHANGED

@Override
public ArrayList<Actor> getActors() {

  int minRow = Math.max(getLocation().getRow() - 2, 0);
  int maxRow = Math.min(getLocation().getRow() + 2, getGrid().getNumRows());

  int minCol = Math.max(getLocation().getCol() - 2, 0);
  int maxCol = Math.min(getLocation().getCol() + 2, getGrid().getNumCols());

  ArrayList<Actor> actors = new ArrayList<>();

  for (int row=minRow; row<maxRow; row++) {
    for (int col=minCol; col<maxCol; col++) {
      Actor actor = getGrid().get(new Location(row, col));
      if (actor != null && actor instanceof Critter) {      // CHANGED
        actors.add(actor);
      }
    }
  }

  return actors;
}

@Override
public void processActors(ArrayList<Actor> actors) {

  if (actors.size() < c) {
    // Get lighter
  } else {
    // Get darker
  }

}