Bernie's Nightmare | Impossible mode guide
2This mode is literally impossible without this cheese of getting enemy AI stuck
always use crouch jumping when getting on top fo things
clicking middle mouse drops objects
do not open doors with items in your hand to prevent them of despawning
do not jump during the elevator ride to prevent starting over
1. grab flashlight and run to the far side sight bedroom and jump on top of the bed
2. wait for some time on the bed and grab the red key from the end of the bed drawer now and carry it downstairs so you dont unstuck the AI later (I don't know whats the best wait time but you need to wait for the enemy AI to wander into the room below you)
3. run to the corridor where you came and open the drawer and jump on top of the sofa through it (do crouch jumping with ctrl)
4.same as the bed you need to wait for some time here so the AI doesnt detect you and is as far as possible (sometimes if you are too slow the AI might go next to the piano which is under the sofa but that might be salvageable if you play it right)
5. run to downstairs and see if it worked and the enemy is approaching you from the living room
6. go behind the piano and position yourself so the enemy is about to go around the piano so you have the max distance possible
7. run to the living room and check behind to see how much distance you got
8. if you think you got enough distance you can try to grab the battery with the same run so you dont unstuck the enemy AI later
9. if you think the enemy is too close jump on top of the sofas to create distance
10. get yoursef between the sofa corner and the small table and crouch jump to the kitchen side when the enemy is close to you
11. if she is running between the sofas against the table you have done it correctly and she will stay there unless you go to the bedroom at the end of upstairs or go get that battery if you missed it while running