In the location Sewers missing cube with QR-code.

[Ы У А]

http://i.stack.imgur.com/CHoWK.png - should be like in the picture, but I have this cube with the QR-code no. I've read that in order to get one you need to activate the secrets of the rooms from the throne. In the old room I activated the secret, but without 3D glasses, and the new room, when it will appear 3d glasses, I can not activate anything, and with a question mark hanging there, but judging by the guide, there is something to to make. Please help. Sorry for bad English.

[Ы У А]

up

[Zinkr7x]

Answer:
RT, RT, LT, RT, RT, RT, LT, LT, RT, LT, LT, LT, RT, LT, RT, LT
All I recall is that the QR code reveals the answer to this puzzle or something.
Do note, this is the Xbox versions. I'd imagine PC version is the same.

[Twillin]

If you do the Throne Room code in eaither the new or old you are done. It will only kick off once. That QR code is also useless if you have again already done the throne room one.