[Easteregg guide]
1. Teleport to the PaP room the first time, it will trigger the hid n' seek quest.
2. Find and shoot 5 hidden samanthas around the main map.
3. Look for a purple rock on the pap room, should teleport you to an island.
4. Collect souls around a meteor in the island. When done you will convert the meteor to an artifact. Grab it.
5. You will be sent back to the main map. There will be mysterious wall that dissapears by the train cart. And in there will be a round artifact. Knife it.
6. Collect souls around the artifact. When done pick it up.
7. Samantha steals your artifacts and an exceed with much greater power. Go to the teleporter and you'll have to survive various waves of the undead.
8. When done grab the artifacts samantha had took from you and you'll teleport out to the main map.
9. A song will be played. Wait 98 seconds and a teddy bear on smoke will appear on the couch with wonder weapons along with the $50,000 buyable ending.
[Aditional EE]
Space suit: Kill more than 500 zombies and a space suit helmet will appear on the right side of the gate by the power switch, press F on it and a space suit skin will be applied to your character.
Golden space suit: after beating the Easteregg you will be able to get a thundergun out of the box. With the thundergun shoot a clock on one of the hallway's room and a 60 seconds to run and use the teleporter. You will be teleported to a small room with a powerup in it. Pick up the power up and a golden spacesuit will be equiped to your character.
Free 1000 points: shoot the front nazi symbol on the teleporter and you and your team will receive 1000 points.
Free perk: shoot the teddy bear at spawn and you'll receive a perk ( note: turn on power if you want to use the perk ).