Limited Ammo RPG idea, You get a set amount at the start of the game and it's up to you to manage it. Maybe 500 of each type, less for missiles, nukes and it has to last the entire game. You run out, that is it. You're only allowed to put 1 point in any damage/defence related perk that effects yurself. You have to visit every settlement in the game too during your playthrough. You cannot pick up any ammo and you need to have every settlement green in every stat. Could prove a challenge. Once you have achieved all that you need to complete the MQ.