For those who don't know (I'd be shocked if you don't) Fallout New Vegas will have a gameplay option known as Hardcore mode. It will make the game more challenging, but is separate from difficulty settings as it effects fundamental gameplay mechanics rather than simply allowing a Raider to take a shotgun blast to the head 10 times. What we know differs from Fallout 3 so far: -Stimpaks don't heal instantly, but over a short period of time, meaning you can't just spam them but have to find cover. -Ammo has weight so you have to pick and choose what you carry. Assuming the strength to weight carried ratio is the same it will also mean you can't carry 4 sets of power armor around. -The player has a dehydration meter which depletes over time. It must be replenished with food your carrying or by finding a water source. -"Enemies use tactics to over come you." This is a direct quote from the Vault as it's not yet clear what tactics this could mean. There are also a couple of unconfirmed changes, like the possibility of no fast travel and others we haven't heard about. So, assuming you buy the game, will you play Hardcore mode from the get go?