Versão em inglês, msg boas vindas e o tente de novo ao final que tal?
<META charset="UFT-8">
<script>
function jump() {
document.write("<br><br>");
}
function show(frase) {
document.write(frase);
jump();
}
// show welcome msg
alert("* Welcome to our gessing game! *");
alert("You should choose a number between 1 and 99 for your kick.");
// game
var secretNumber = Math.round(Math.random() * 100);
console.log(secretNumber);
var kick = parseInt (prompt("What's your kick? "));
if(kick == secretNumber){
show("<h1>You win!</h1>");
} else {
show("<h1>You lose. The secret number was " + secretNumber + "</h1>");
show("Do you want to try again?");
}
</script>