I want to record the user guess and show them a "letters guessed" array. Below is the code for my hangman game

using System;

namespace AssignmentFinal
{
    class Program
    {
        static int numGuess;
        static int lettersLeft;
        public static void Main(string[] args)
        {
            string wordToGuess = GetSecretWord();
            char[] maskWord = GetHiddenLetters(wordToGuess, '-');
            lettersLeft = wordToGuess.Length;
            char userGuess;
            numGuess = (wordToGuess.Length) * 2;
            Console.WriteLine("Welcome to Guess The Word game!");
            while (numGuess > 0 && lettersLeft > 0)
            {
                Console.WriteLine("You have " + numGuess + " guesses!");
                DisplayBlanks(maskWord);
                Console.Write("Enter your guess: ");
                userGuess = char.Parse(Console.ReadLine());
                maskWord = CheckGuess(userGuess, wordToGuess, maskWord);
            }

            //if wrongGuess is 0 exit the program;
            if (numGuess == 0)
            {
                Console.WriteLine("You Lost, the secret word was: " + wordToGuess);
            }
            

        }
        static string GetSecretWord()
        {
            Random num = new Random();
            string[] words = { "hyperbaric", "temporal", "quantum", "radiation", "aardvark", "accident", "dracolich", "professional", "properties", "collections" };
            int wordIndex = num.Next(words.Length);
            string secretWord = words[wordIndex];
            return secretWord;
        }

        static char[] GetHiddenLetters(string word, char mask)
        {
            char[] hidden = new char[word.Length];
            for (int i = 0; i < word.Length; i++)
            {
                hidden[i] = mask;
            }
            return hidden;
        }

        static void DisplayBlanks(char[] characters)
        {
            Console.Write("Secret Word is: ");
            foreach (char letter in characters)
            {
                Console.Write(letter);
            }
            Console.WriteLine();
        }
            static char[] CheckGuess(char letterToCheck, string word, char[] characters)
            {
                //boolean to check for wrong guess
                bool wrongGuess = true;
                if ( numGuess > 0)
                {
                    for (int i = 0; i < word.Length; i++)
                    {
                    
                        if (word[i] == letterToCheck)
                        {
                            
                            characters[i] = word[i];
                            lettersLeft--;
                            //if match set wrong to false
                            wrongGuess = false;
                        }
                    }
                }
                //if wrong guess decrement
                if (wrongGuess)
                {
                    numGuess--;
                }
            return characters;


            }



    }
}