The only prerequisites to begin this main quest is to turn on power and get the Heart key.
In order to awaken the dictator, you need to teleport to Samantha's bedroom and to interact with the music box.
After that, Hitler will spawn at the school and will be chasing a random player.
Hitler will slowly chase a random player, and he can't be killed.
If you get close to him, he'll make a powerful hit that damages the surrounding zombies and the player.
If he gets hit in any way (directly shot, bomber's explosion or nuke), he will start running. If he hits you while running, you're going to lose your last perk
Now begins the Samantha's game. There are 4 games represented by 4 icons on your TAB inventory.
Each of them can be done simultaneously.
I've ranked the games from easiest to hardest (even tho none of them is actually impossible)
Every game starts the same way, by interacting by a crying Samantha's near the beginning of each game.
The clock game is by far the easiest. All you have to do is interacting with 5 clocks in a certain order, around the map.
The crying Samantha's trigger for this game is at the 1st floor of the library, right after the stairs.
Once the 5 clocks are lightened up, you can grab the fuse at Spawn, after the stairs.
In order to achieve the Tardis game, you'll have to repair 8 power panels around the map in order to be able to send back the Tardis.
You'll first need to grab a Hammer, there are 4 of them in the map, one for each potential player.
At Spawn room
On a table at the Cloister
At Classroom wing next to Double Tap
Behind the teleporter at Dining Hall
The crying Samantha's trigger for this game is deep down the Boiler Room, in front of Tunnels (you'll need to open the door)
Once all 8 power panels are fixed, you can interact with the panel in front of the Tardis at the bottom of the Boiler Room to send it back. After that, you can collect the fuse.
To achieve this game, you'll need to shoot 4 radio and mimic the morse code they'll output at the radio room in Gardens.
To make a long input, you need to hold your interact button until there is no noises, to input a short just make a single press.
The crying Samantha's trigger for this game is beneath the Gardens stairs, next to the shield crafting bench
Now interact with the shoulder of the man in front of the radios to launch the raid
An airplane fleet will spawn, and will start bombing the basement
You can now teleport to the basement and collect the fuse
First thing you need to do is to get the Heart key and unlock the Spider room.
Once done you can interact with Samantha's ghost to start the game.
A big thanks to Sassy Asi on youtube for making this step clearer to me, check her video guide if you're struggling on this step
The crying Samantha's trigger for this game is in front of the Heart key room
Before going into the puzzle, let's name the graves and the symbols
When you enter the room :
1 - Right front grave
2 - Left front grave
3 - Left back grave
4 - Right back grave
When you look up with the Nazi cross at the top :
A - First symbol
B - Second symbol
C - Third symbol
D - Fourth symbol
Interacting with the graves will move certain circles, here is how they move :
Grave 1 : Moves A & D
Grave 2 : Moves D
Grave 3 : Moves B & C
Grave 4 : Moves A & B
Now let's get to the easy solution, you'll need to interact with a set grave until a set symbol is on a line, in front of the Nazi cross.
Grave 3
Grave 4
Grave 1
Grave 2
Once done, you can now grab the fuse on the front grave.
Now that you collected every fuse, you need to put them into a lion head statue and collect 20 souls in front of it.
Once done you can take back the fuse and do another lion head, in total there is 4 of them.
Now move up into the computer area of the Boiler Room and you will need to play 4 games of Simon says that will get harder every time.
When you complete it, interact with the computer again.
Now the link pad should be overpowered
Interact with the fuses to summon a black hole
Hitler will start walking through it, once he got inside, interact with the fuses once again
You should now be granted with a Perkaholic and a Blundergat, if you interact with the link pad, Samantha's Ghost will spawn one last time.
Interacting with the Crying Samantha to start the finale of the map.
Now a text will appear on-screen telling you to run, you have to get to the teleporter main frame.
Make your way to the main frame, either by the stairs or the Tunnels
There should be Samantha standing inside the main frame
You now have to survive until the Crying Samantha's ghost comes in.
Once the ghost have entered the body, interact to launch the teleporter and congrats you've beaten Return To Das Herrenhaus !