Sons of the Forest is an action-adventure game developed and published by Endnight Games. In this game, you play as an unnamed protagonist that must help a group of survivors to survive in a hostile forest full of monsters. One of the objectives in the game is to open the arm door which is located in the cave near the entrance.
The arm door is an exclusive feature in Sons of the Forest. It is a metallic door with an arm-shaped symbol on it. It is located at the end of a long and dark cave and is the entrance to a secret area of the game. The arm door leads to a room with a special item that cannot be found anywhere else in the game.
To open the Arm Door, you must first head to the Cave entrance and navigate the narrow passage to enter. Climb down the stairs and use the Maintenance or Blue keycard to open the security door on the right. Walk straight through the corridor and take the stairs to the lower level. Upon entering the door, a cutscene will trigger.
Continue straight ahead and look for the small emergency door sign above an unlocked door. Keep traversing the corridors until you come across a liquid fluid splurging out of the third corridor to the right. Take a right and enter the room to find the Golden Armor on the couch. Gather the Golden Armor and exit the Cave.
The Arm Door will now be open, allowing you to explore the depths of the Cave and discover the mysteries that lie within. Keep an eye out for enemies and other threats as you explore the area, as you never know what is lurking in the shadows.
Once you have made it through the Arm Door, you will be able to explore the depths of the Cave and uncover the secrets that lie beneath. With the Golden Armor in your possession, you will be better equipped to survive the dangers of the Cave and make your way to the end.