Guild Wars 2

Is there any content that is challenging but doable for two players? I assume dungeons and fractals require 4 or more. So far some of the hero points in HoT zones need at least two, but I can’t think of any others.

some of the mini-dungeons are nice for that. Orr in general is better with 2.

Wish there was more myself. Kinda miss the old Kessex toxic tower, it could be pretty hard to take on with 2 man.

Most fractals can be done with 2 players, and 2 manning them would definitely make them much more challenging. Likewise most, but not quite all, dungeon paths can be done duo, or even solo. So start looking at those.

Underground Fractal needs an absolute minimum of 3 players to progress past the first part, though I doubt its possible without at least a fourth