You need to walk against the poster with the main menu on it in the waiting room. There's a hidden passage. You can only do this after getting the Triangle Energy Drink from the vending machine. After opening a door you will find a sleeping pill. Pick this up and continue the game like you would normally. When you reach the wildlife section, you have to pull the lever and throw the pill inside the tiger's cage before pressing the red button. Now you have to be quick, the sleeping pill only lasts about 10 minutes. After completing what you, untill now, assumed assumed is the complete playthrough, you'll hear a snorring sound from the tiger.

You'll see a window pop up with all your friends that have the game. You can also press the "Find random player" button if your friends aren't online. I don't advice choosing a random player for this because sometimes it takes ages before they reach the romm with the big switch for the lights. You'll be stuck there in the dark untill he or she flicks that switch.

The main tip here is: When you decide to enter the mansion via the orangery, don't wait too long before pressin the elevator button, it'll make the narator of the person on the other side of the wall very anxious. If you're silent, you might even hear him.