Heartstopper

Heartstopper is the major easter egg of Krankenhaus der Toten. It is the only way to leave the hospital and access the ending cutscene. After completing the EE, certain weapons are added too the mystery box pool.

Step 1: Preparations
It is necessary to create the Surgeon as quickly as possible. Once it has been obtained, use it to kill The Doctor. Now head down to the 115 Room. There will be a pump filled with liquid. Depending on it's colour, different actions must be taken.

Blue
The Viktor Samarov player must go into the power room and flip the power switch on and off until it breaks (power will remain on once broken.) to summon Avogadro. Defeating Avogadro will trap him in the generator.

Yellow
The Elizabeth Richards player must go into the Childrens Ward, where there will be four items scattered around the room, a train, a bear, a ball and a toy car. She must activate all four these items and then kill the Ghost Child that spawns.

Green
The Niamh McTavish player must go to the Quarantine room and kill 50 zombies to charge up an orb in the centre of the room. Once it is full, Niamh must knife it until it breaks, releasing a green gas into the room.

Red
The Dragon player has probably the easiest task, as all he has to do is kill 100 zombies.

Once this task is complete, the character must return to the 115 room and collect a coloured 115 sample.