Claiming to awesomeness that was Portal 2, I know kinda late but meh finally completed the rest of puzzles in Co-op.
Thens there is the silliness of personality cube:
then theres a silly site of personality cube like nooooo and objection:
http://spaaaaaaaaaaaaaaaaaaaaaaaccee.com/
Should turn down your volume if you decide to go there and click.
That is all.