Verrückt: Samantha’s Sorrow

The song

Samantha’s Sorrow is the musical Easter egg added to Verrückt by Zombies Chronicles, a song by Brian Tuey. The same hide and seek game, with dolls of Samantha, exists on several maps of the pack, each with its own trigger. On Verrückt it starts in the bathroom with the three toilets, upstairs on the German side, the room where Lullaby for a Dead Man is played.

Steps

In the bathroom, flush the rightmost toilet nine times.
Flush the middle toilet three times.
Flush the leftmost toilet five times. With the last flush, a thunderclap is heard: 9, 3 and 5, a reference to Group 935.
A doll of Samantha appears on the ground in front of the Der Wunderfizz machine, in the next room. Interact with it: more dolls start to appear around the map.
Each doll spins like a ballerina and plays a music box tune, which helps to find it. Shoot it; the next one appears, until a second thunderclap.
Go back to the doll by the Der Wunderfizz and interact with it. A skeletal hand drags it into the ground, a Max Ammo drops and the song starts.

One of the three toilets of the bathroom upstairs on the German side, Verrückt, Call of Duty Black Ops III Zombies

The three toilets stand side by side against the tiled wall. Counting from the right, the order is nine, three, five.

The nine dolls

The fountain

In the middle of the courtyard, on the statue of the fountain.

Behind Speed Cola

On the balcony that can be seen from the left window behind the Speed Cola machine.

Bathroom

Inside the rightmost toilet of the bathroom on the left side, before the power.

Morgue

On a body tray of the medical room near the spawn.

Mannequin

On top of the mannequin next to the Mystery Box spot at the top of the stairs on the left side.

Kitchen

In a pot in the kitchen, between the Power Room and the Speed Cola room.

Patient chair

On the patient chair near the spawn.

Mule Kick room

On the ceiling, seen through a barrier on the wall of the Mule Kick room.

Above Mule Kick

In the room above the Mule Kick machine, in the burning hole of the ceiling.

Lullaby for a Dead Man

The song of the original is still there: flushing the leftmost toilet three times plays Lullaby for a Dead Man, by Kevin Sherwood and Elena Siegman. On Black Ops III, as on Black Ops, a radio on a desk, seen from a window of the balcony on the American side, also plays music from the campaign when it is shot.

In the First Room

Doors closed, neither song can be played: the bathroom is upstairs on the German side, past the left balcony, and the Der Wunderfizz stands next to it, far from both starting rooms.