Another way of solving the challenge

// First we set the variables for the questions and answers
var answer1 = false;
var answer2 = false;
var answer3 = false;
var answer4 = false;
var answer5 = false;

var correctAnswers = 0


var question1 = prompt('Which color is the sky?');
var question2 = prompt("Which company is the creator of the MacBook?");
var question3 = prompt("Who is Luke Skywalker's father?");
var question4 = prompt("What is the name of Link's fairy?");
var question5 = prompt("What is the name of the coldest region in The Elder Scrolls?");

// Then we set the conditions to determine if the answer is true or false
if (question1.toUpperCase() === 'BLUE') {
  answer1 = true;
  correctAnswers += 1
}

if (question2.toUpperCase() === 'APPLE') {
  answer2 = true;
  correctAnswers += 1;
}

if (question3.toUpperCase() === 'DARTH VADER') {
  answer3 = true;
  correctAnswers += 1;
}

if (question4.toUpperCase() === 'NAVI') {
  answer4 = true;
  correctAnswers += 1;
}

if (question5.toUpperCase() === 'SKYRIM') {
  answer5 = true;
  correctAnswers += 1;
}

//We then tell the user how many questions he got right

document.write('<p>You answered ' + correctAnswers + ' questions correctly</p>');


//Then we set the conditions to earn the different crowns

if (correctAnswers === 5) {
  document.write('<p>You won the golden crown!</p>')
}

if (correctAnswers === 3 || correctAnswers === 4) {
  document.write('<p>You won the silver crown!</p>');
}

if (correctAnswers === 1 || correctAnswers === 2) {
  document.write('<p>You won the bronze crown</p>')
}

if (correctAnswers === 0) {
  document.write('<p>You won no crown. You suck.</p>');
}