Experience Points

Experience points (short XP) are a measurement for how your character is progressing. The player character can earn experience points for killing creatures and solving quests. They are used to determine when a character should gain a new level. Different amounts of experience points are awarded for killing more dangerous creatures. For example, in Fallout 3, killing a deathclaw will get you 50 experience points while killing a radroach will give you 1 experience point. Experience points can also be gained for disarming mines and traps, picking locks, hacking computers, passing speech challenges and occasionally doing sections of a quest.

Fallout 3 difficulty modifier
Changing the difficulty level will also change experience gained from killing enemies. On Very Hard you will receive 150% of the regular experience for a kill, while a kill on Very Easy will only yield 50%. For example, a deathclaw is worth 25 XP on Very Easy, 50XP on Normal and 75XP on Very Hard.

While this means that you can gain up to three times as much experience from fights on Very Hard compared to Very Easy, this is somewhat compensated by the enemies being much tougher. In the end, it depends on the player´s skills and play style which difficulty setting allows for faster leveling. Some people play on very easy until their enemy is about to die and then change the difficulty to very hard and finish them off to get the XP amount from being on the very hard difficulty. Some great places to use this method of gaining XP are Old Olney, Bethesda Ruins, and Mason Dixon Salvage as the enemies there re-spawn every 73 hours (3 in-game days).

XP caps at level 20 on all difficulties.

Fallout: New Vegas
Fallout: New Vegas, however, does not reward XP increases based on the level of difficulty selected. This somewhat alleviates the stress encountered while playing the game simultaneously on Hardcore, as it is not necessary to play it on Very Hard. A trophy/achievement is not awarded to those who play the game on Very Hard nor do you gain bonus XP.

Bugs

 * If you earn experience points, then load a older save right before they register, you will get the points in the older save. An easy way to do this is to kill multiple enemies that deal XP independently and load in between the separate XP gains.

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