The Stanley Parable Reassurance Bucket is an item and character introduced in The Stanley Parable: Ultra Deluxe. It is supposed to comfort Stanley while playing the game, but also changes dialogue and greatly effects most endings. It is constantly referred to as an animate object, though appears to only be a bucket.
The player must first complete the Sequel Ending and unlock The Stanley Parable 2. The Bucket will be then be obtainable before the Two Doors Room, no matter the layout.
When holding the Bucket, several endings are changed completely from their original versions.
Left Door Endings
Freedom Ending: Stanley cannot actually leave because The Office does not want the bucket to leave, causing the door to close on him.
Countdown Ending: The Bucket hits the ON button instead and reveals that the Mind Control Facility is a cover-up to spy on silly birds all over the world.
Museum Ending: The museum is instead one focusing on buckets.
Mariella Ending: Stanley goes insane due to his bucket being missing, Mariella backflips all the way to work because "my life kicks ass", as she still has her bucket.
Escape Pod Ending: Stanley instead puts the Bucket in the escape pod which makes it disappear from is pedestal in the next reset. After the next reset a replacement bucket will be present (so noted by a "replacement bucket" sign), with the Narrator asking Stanley not to lose this one.
If one plays the epilogue after, the escape pod will be present, with the Bucket inside it.
Broom Closet Ending: The Narrator claims the Broom Closet is mocking Stanley and places stickers on the Bucket.
These stickers are permanent and persist between resets.
Bottom of the Mind Control Facility Ending: The Bucket and Stanley get comfortable at the bottom of the hole, at least for so long.
Elevator Ending: Stanley becomes obsessed with the number 3 and gives a conference on it, which doesn't end well.
Right Door Endings
Confusion Ending: Takes Stanley to an intervention by classic characters (Adventure Line, Broom Closet) who want him to destroy the Bucket.
Powerful Ending: Stanley jumps off not to prove that he's powerful, but to avoid separation from the Bucket.
Cold Feet Ending: Nearly the same, except The Narrator insists that the Bucket will soften his fall, which it doesn't.
Apartment Ending: Stanley spends his life with the Bucket instead and the Narrator goes crazy claiming he wants the Bucket himself.
Not Stanley Ending: The Narrator-
