What is wrong with this code? It may seem correct, but it does not evaluate correctly.

var correctGuess = false;
var randomNumber = Math.floor(Math.random()*6)+1;
var guess = prompt("I am thinking of a number between 1 and 6" + " Hmmmm... I think the number is...");

if(parseInt(guess)===randomNumber){
  correctGuess === true;
}else if(parseInt(guess) < randomNumber){
  var guessMore = prompt("Hmm....the number is greater than " +  guess);
    if(parseInt(guessMore) === randomNumber){
      correctGuess === true;
    }
}else if(parseInt(guess) > randomNumber){
  var guessLess = prompt("Hmm....the number is less than " + guess);
    if(parseInt(guessLess)===randomNumber){
      correctGuess ===true;
    }
}

if ( correctGuess===true) {
    document.write('<h2>You guessed the number!</h2>');
} else {
    document.write('<h2>Sorry. The number was ' + randomNumber + '.</h2>');
}