DAMMMMMN I GOT THIS ALREADY!! I'm suck a fool lol

I do know why is V = 4.5, but I really can't figure out how the formula in the robot mouth works...

This one....the only thing that I can tell you is that you have to leave the door at the down left corner to be open

You have to go down and play the first movie tape! And then they will show you the colour that you have to use it for the password

But how? How do you know that?

Did you see the poster on the floor? That's the diagram that you are suppose to make it

I think you see it wrongly it's a1d3

How to solve this?

It doesn't matter, go down and play the movie by clicking the tape behind the onion man