This is a quite strange game, where your main goal is to click all these guys and collect different useful things. Just explore different rooms, and be ready to use all your brains. Be sure that you will have a lot of pleasure here. So, enjoy the game right now.
So, this is a simple click does most everything except decipher the codes for you. You will have to navigate by clicking the edges of the screen wherever a grey bar appears to turn or back up, or clicking a doorway to go through it, just follow the changing cursor to find, and click on, the active areas in a scene. By the way, there'll be times you'll want to combine inventory so just a few clicks takes care of it all. Which brings me to something else you'll want to click on: the save button. Good luck to you!