>Hardcore mode
>Can only carry 1 2 handed weapon, 1 1 handed weapon and 1 1 handed melee weapon
>10 clips of ammo per weapon, no carrying of any ammo that isn't used by carried weapons
>Swapping weapons require dropping the old weapon and all the ammo for it
>No carrying stimpaks; they can only be used on the spot when found. This also applies to food and water.
>1 doctors bag because fuck head crippling
>3 grenades maximum
>No companions (because Boone is a fucking ranged god), or making it so they're ineffective (because Obsidian make good characters)
>No drugs
>1 antivenom because cazadors can 1 shot you otherwise
>Repairing must be done on the spot as well
>Quick travel is allowed because there's nothing to see and so few random events
>Can carry as many caps as you want but
>Anything else that isn't weightless can not be picked up.
^ Actual hardcore mode. Makes melee weapons useful for ammo conservation, you constantly are swapping out weapons as they run out of ammo or break, and food, water, caps and health suddenly have become precious resources instead of shit you're overflowing with. Playing like this turns FONV into a pretty fun survival game, which is what HC was supposed to do.
Running out of ammo and limping off with 3 bars of health left ducking desperately in and out of cover as some raider is shooting you, ducking into a broom closet, D:'ing because you realise your trapped and then

'ing because theres a first aid container in there so you can heal up and take down that last raider with your knife is an experience that is unique to playing like this, and I loved every minute of it.