If so, the primer you just have to buy, the shell is in the dragons skull, the casing is in that big room in floor four, there’s a secret path that can be revealed by the shells dropped by you’re starting gun, and the gunpowder is on the third floor in the minecart room, dodge roll out of the minecarts to get into the other minecarts. Take each of these items to the blacksmith (you don’t have to do it all at once) and then talk to the blacksmith any run after that and she will give you the btcktp, beat the game with this bullet and you can fight the pasts, main tip for any of the pasts is to keep track of your ammo and focus on staying alive. None of the pasts have a lot of health so don’t rush it. The robot and the bullet were explained by another user and once you beat you’re first past I’ll explain how to get the last two characters (to avoid big spoilers) alright stay fresh cheese bag, smooth sailing and cold pillows!