Vindictus

Yeah, there's around the same amount of "empty space" as Twilight Desert and small amounts of enemies, but it takes longer to get through because you have to climb or use these mine cart elevators to get to higher levels.

And there's also this one area with pit traps. They don't even hurt or anything, they just collapse under you then make you climb up a ladder to get back up. Pointless, really. (Unless there's something added to them in higher level ranges.)