There is no more a master key in Fallout 3.
yes
You do not need a key to open the vault. All you need to do is go to the blinking box next to the door and it will say to press a button to activate it. When you press the button then you will hear a siren and it will open the door.
There are no Mounts in the unmodified version of Fallout 3.
You can find President Eden in Fallout 3 at Raven Rock, but he is also a computer!
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you can not find any energy cells in Fallout 3 after you find the ones with the alien blaster, you are limited to that number
No, you can only craft, find or buy the dart gun in Fallout 3.
contract killer perk
You would need to have the PC version of Fallout 3 and download a mod.
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find who
In Fallout 3, the key to Hamilton's hideaway is found on the corpse of a man named Hamilton himself, located in the nearby Hamilton's Hideaway area. You can also access the hideaway by using a terminal to unlock the door if you don't have the key. Inside, you'll find various loot and items related to the game's story.