I ate all the tacos leading up to the point I need to give robert a taco and now I can't find any, what do I do?

In the warehouse segment there is a retina scanner or eye scanner, whatever. i have tried my own and multiple robot heads to get in but its not working! Anyone know the solution here?

It seems I messed up the player guiding voices / save points by managing to skip a floor. Maybe. The issue: I got no explanation why I am supposed to activate three PCs. It just popped up in my objectives. On the way up to floor 99 where you meet the TV news robot, according to a lets play video, he says that the human is here. Didn't say anything for me. When I shot the portal gun into the mainframe tube, no voices were triggered either. Just the updated objectives again. That kinda takes the fun out of ...

I don't know if any experiences the same... The train level which is the first one in this game runs very poorly. Sadly there are no graphics options in this game. On the second level it performs way better, but the moment a robot discovers me, the framerste get a nosedive until I kill em. I would take a guess that the game engine has an issue of building a path to the players position for the robots to go..... Nevertheless, this kinds makes it hard to fight them when the game starts to stutter.. Any...

I'm a little wimp. Just gonna get that out of the way. Because of this, I have not completed Adam in either games, and that wasn't a problem in the 1st game because nothing happens after Adam. However, in BC2, there is a lot of content that I would be skipping if I just don't play Adam. I know how to open the elevator without killing Adam by using one of the normal Supervisors head by the grinder, but if I even see those red flashing lights come on for even a millisecond, im outta ther...