The Stanley Parable floor is an Interactive floor where players are in a heaven like room and on the other side is a normal room. The normal has a hanging sign that says "The Stanley Parable" with an "8" button beneath it. You can press the button as many times as you like! This floor is a reference to the game "The Stanley Parable".
Fun fact: In the old lobby, if a player inserted just 8's into the panel and pressed enter, it would say "8".