Gimpy(String question, BufferedImage challenge, String response, boolean caseSensitive) {
        super(question, challenge);
        this.response = response;
        this.caseSensitive=caseSensitive;
    }

    Gimpy(String question, BufferedImage challenge, String response) {
        this(question, challenge, response, true);
    }

they have package scope, but need to be public or protected. Sometimes there is need to create own Factories overriding some methods in this class.