Question

Just above the answer box an error would appear on wrong attempt which
says "Incorrect Answer". Additionally we have unlimited number of
attempts.

Above is the website preview with detailed information.

Code:

<form id="level" method="post"> 
    <label for="answer">Answer:</label> 
    <input type="text" name="answer" id="answer" /> 
    <input type="submit" name="submit" id="submit" value="Submit" /> 
</form>

So simply here we get to know that the form does not have action source.
The only way (which I know) is to hack through javascript.
Like the one used to spam Facebook and Orkut, where we have to put in the javascript in URI, address bar.

I have built a javascript (for the address bar) to link to the other javascript files.

And if someone know some online javascript brute force script or something online that could be linked through javascript.

Answer 1

As much as I hate to tell people how to do this sort of thing, it’s an interesting problem.

I should say first, however, that a brute force solution will likely take too long to be practical. If the solution is 8 characters long, and we try 1 million possibilities per second (a very optimistic assumption), it would take about 5 years to try out all of the possibilities.

Nevertheless, here is some Javascript code that you should be able to modify to fit your needs:

var chars = ["a","b","c","d","e","f","g","h","i","j,","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"," "];
while(document.getElementById("answerResult").innerHtml != "Correct Answer"){
  var len = Math.floor(Math.random() * 20);
  var str = "";
  while(str.length < len){
    str += chars[Math.floor(Math.random() * chars.length)];
  }
  document.getElementId("answer").value = str;
  document.getElementById("level").submit();
}

This solution does not actually use brute force. It implements a method similar to bogosort. While more fun and simple, it may take a bit longer to finish. If you’re an incredibly lucky person, it might be solved on the first iteration.