I cant get access to the Youtube because of a probable government-level firewall, but I can just put some domestic links here if you guys are interested.
walkthroughs:
level 14 (no premium):
campaign/normal
http://www.aipai.com/c9/OzsKCArKmgnaiUu/playerOut.swf
heroic/normal
http://www.aipai.com/c9/OzsKCMjKmgnaiYg/playerOut.swf
iron/normal
http://www.aipai.com/c9/OzsKCMgKmgnaiIo/playerOut.swf