Borderlands – Is it possible to sort items by worth in Borderlands 2

Experience & drops

Is experience gain individual, divided/split between players, or duplicated for each additional co-op player?

Each player gets the same experience. It is not split between them (like credits), but everyone gets the same amount (like ammo).

Do you get experience for others' work when you aren't in the same area of the map?

You have to be relatively near an enemy kill (but not that close) to get the XP. (I think.) But quest experience is given no matter who turns in the quest and no matter how far away they are.

Do all players get the same quest rewards?

All players get the same rewards, with the exception if the quest gives different guns per class or random guns. If it's a single item, it will simply drop into your inventory if you weren't the one to turn it in. If there is a choice of items, everyone will get the mission accept dialog to choose their reward individually.

How are experience, difficulty, and item/money drops affected for each additional co-op player?

I don't have exact stats, but there becomes more XP/items/cash and increased difficulty for each additional player.

Does the area difficulty scale to only the host's level, or does it accommodate/average difficulty between all players?

Host level, just like Borderlands 1. (You can twink low characters this way, as long as they don't get themselves killed everyone 10 seconds, I guess.)

Large level differences

Some games have disincentives when characters with large level differentials play together—is that the case in Borderlands 2?

I haven't researched this, but I think the mechanic is similar to the way Borderlands 1 worked: meaning the XP is shared (not split) no matter your level.

Are higher-level characters' stats adversely affected when joining a lower-level character's game? Or vice versa (boosting a lower-level character using a higher-level character's game)? Are experience gain or money/item drops diminished/impaired with large level differences? If so, what are the specifics?

It doesn't appear to alter the play stats or drops for differing levels. Basically, the host determines the level of enemies and drops, with number of co-op players increasing difficulty of enemies and amounts of enemies and item drops. (Though this isn't confirmed yet.)

It appears that Borderlands 2 can see only up to the current resolution. So if you have it set to the default, it can see up to 1440x900. If you go to the display preferences and set the resolution to "More space", it can see 2048/1280 (which is pretty close to full retina, and is easy to do).

To run at full resolution, download the Change Resolution app mentioned in Bora's answer. Then, change the resolution to 2800x1800. Then, start Borderlands 2. You will be able to set it to this resolution in the options.

Unfortunately, it doesn't seem to remember the setting. Furthermore, unless you have eagle eyes, you're probably going to want to move the resolution back down again when you are done. But changing the resolution tends to mess up your window sizes. There are tools that can help you with that, though, if it comes to be an issue.

A few caveats on running at full retina:

• The game will be a bit choppy. You may need to actually pick one of the options below 2880x1800, just so it runs smoothly enough. Quitting all other programs and unplugging any external displays first can help. Also try adjusting some of the other video options. It will be even slower if you run multiplayer. Also, make sure your computer is plugged in, or else the video card and CPU will run at reduced capacity to try to save power. I personally just run at the default 1440x900 when playing multiplayer, as it's otherwise unplayable, but run retina when playing by myself, as it works reasonably well then.

• The game literally thinks that you have a giant 2800x1800 monitor. So some things are going to be really small. In particular, the mouse and any caption text will be a quarter their usual size. This was also the case in Borderlands 1.

• Certain game elements will not be retina. This applies in particular to the loading screens. It's not going to kill your game experience, but if you're going to show off the retina to your friends, do it with actual gameplay.

• Like I said, it won't remember these settings. You have to change the resolution before you start Borderland 2 each time, and then go in and change the resolution.