help to understand with a choice of DLS (Don't Starve)

help to understand with a choice of DLS.
when starting a new save appears 4 cells: DS, RoG, SW, HAM.
DS: a selection of hamlet or sw
RoG:a selection of hamlet or sw
SW: Elite choices include hamlet or not
HAM: When clicking the checkbox just put.
I can't just turn on all 4 DLS and play? Each DLS is a world which turns out in conflict with others?
if the poke world setting, then poulchaetsya that I can choose hamlet ONLY if tyknite 4-cell, that is, no combinations with hamlet to make out?
as I understand it the maximum that it is possible to include both sw ham if to press the sw and agree to hamlet, but then RoG is not, right?