Simple Word Guessing Game

package com.company;

import java.util.Random;
import java.util.Scanner;

public class Main {

    /**
     * constants to keep the words for guessing ( one constant for each level )
     */
    final static String[] EASY_WORDS = {"bag", "car", "man", "toy", "fat", "own", "bee", "ham", "egg", "spy", "pig"};
    final static String[] NORMAL_WORDS = {"town", "house", "circus", "bridge", "hook", "crab", "cave", "hang", "wife"};
    final static String[] HARD_WORDS = {"elephant", "accomplishment", "representative", "establishment", "barman", "economic", "cardinal", "bottle"};

    /**
     * Simple scanner
     */
    final static Scanner SCAN = new Scanner(System.in);

    /**
     * MAIN METHOD - calls the wannaPlay method.
     * @param args
     */
    public static void main(String[] args) {
        wannaPlay();
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////
    /**
     * wannaPLay - keeps rolling and ask the player to choose a level: easy, normal or hard (case insensitive)
     * if player enters something different than level names, prompts the player to quit or not (Y/N case insensitive)
     * if player enters n/N - keeps asking for a level, if y/Y - exits the game with a smile
     */
    public static void wannaPlay(){
        System.out.println("Please, choose a level: easy, normal, hard: ");
        String level = SCAN.nextLine();
        String exit;
        if((level.equalsIgnoreCase("easy")) || (level.equalsIgnoreCase("normal")) || (level.equalsIgnoreCase("hard"))){
            chooseLevel(level);
        }else{
            System.out.println("Do you want to quit? Y/N: ");
            exit = SCAN.nextLine();
            if(exit.equalsIgnoreCase("y")){
                System.out.println("Ok, we will play another time. Bye!");
            }else {
                wannaPlay();
            }
        }
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * chooseLevel - basic game method, provoked by the the wannaPlay() - method
     * @param answer- level, chosen by the player, passed by the wannaPlay method
     *
     */
    public static void chooseLevel(String answer){
        if(answer.toLowerCase().equals("easy")){
            hideAndGuessWord(EASY_WORDS, EASY_WORDS.length);
        }else if(answer.toLowerCase().equals("normal")){
            hideAndGuessWord(NORMAL_WORDS, NORMAL_WORDS.length);
        }else if(answer.toLowerCase().equals("hard")){
            hideAndGuessWord(HARD_WORDS, HARD_WORDS.length);
        }
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * The main game method - picks a word, depending on the chosen level, hides it using asterisks and keeps rolling until player guesses the word
     * @param constants - the level chosen by the player. Randomly picks a word from constants arrays with words
     * @param numberWords - the number of words inside the string array. It's needed in order to randomly pick a word from that array.
     */
    public static void hideAndGuessWord(String[] constants, int numberWords) {

        Random rn = new Random();
        String hiddenWord = constants[rn.nextInt(numberWords)];
        StringBuilder guessedWord = new StringBuilder();
        guessedWord.append("*".repeat(hiddenWord.length()));
        char guess;
        byte counter = 0;
        System.out.println(guessedWord);

        System.out.printf("Choose a letter to guess the word ( A - Z ): \n");
        guess = Character.toLowerCase(SCAN.next().charAt(0));

        while(!hiddenWord.equals(guessedWord.toString())){
            if(hiddenWord.indexOf(guess) != -1){

                char[] charArr = hiddenWord.toCharArray();
                for(int i = 0; i < charArr.length; i++){
                    if(charArr[i] == guess){
                        guessedWord.setCharAt(i, guess);
                    }
                }

                if(hiddenWord.equals(guessedWord.toString())){
                    System.out.printf("Congratulations! You guess it! The word was %s. You needed %d tries to do it!", hiddenWord, counter);
                    break;
                }
                System.out.println("Good job! Next character: ");
                System.out.println(guessedWord);
                guess = Character.toLowerCase(SCAN.next().charAt(0));

            }else{
                System.out.println("Sorry! Guess again: ");
                guess = Character.toLowerCase(SCAN.next().charAt(0));
            }
            counter++;
        }
    }
}