Q- Left door light E- Right door light W- Camera light and center hall light A and D- Close the left and right doors Left and Right arrows- Scrolls through cameras. Billy- Starts on the left side of the stage and makes his way to the center hallway. Once he gets to the hallway, he'll run down it, giving you little to no time to react. Slow him down by using the cameras and use the camera light to push him back Celeste- They'll randomly appear in your left or right doors, requiring the light for you to see them. Close the door to make them leave.
Huge credits to @HUHUH_2_91 Recently added a power generator so that it's actually possible to survive infinitely and made celeste guaranteed to spawn after a failed attempt.
