Playthrough 2

Playthrough 2 is a feature in Borderlands that allows players that have completed the game's story-line to start the game over again but keep your character (all of your items, achievements, levels and so on).

Enemies and items are a lot higher level in Playthrough 2 than in the normal difficulty, and can range from Level 32 (starting enemies) to 50. After finishing Playthrough 2 all enemies, drops and vending machines are maximum level. This is sometimes referred to as "Playthrough 2.5" or "Playthrough 2+", although the world cannot be reset and only unfinished quests are available.

Enemy Names
For the second playthrough, the names of all the enemy types are changed. The new enemies are more difficult but otherwise unchanged - for example, Bruisers become Brutes, but their behavior remains the same. In addition, the description "Badass" is replaced by "BadMutha," and enemies with this description are considerably more powerful than the Badasses of Playthrough 1. Completing Playthrough 2 raises all the enemies in the world to high levels (mostly 48+) and again changes all the names, including changing "BadMuthas" to "SuperBads".

Quests
The opening quests do not change. The player is forced to buy a shield and grenades despite having them from the first playthrough. Side quests left to Playthrough 2.5 can give even better rewards and drops.