I've got some troubles in an adventure in Egypt. I'm supposed to hack a computer in the morcuCorp secret base. This is the house where you have to read a book from a bookshelf to get inside. I got down to the basement... However, I don't understand how to open the doors down there! I've tried to step on all the tiles you can step on in a million ways!
I got a message where it said that it would be written somewhere. Have anybody found this?

I hope you understand where I am. I'm not the best at explaining!

Thanks!

This walkthrough should help:
http://walkthruwa.blogspot.com/2010/01/black-bag-job.html