ok... maytag, I'm still going to marry you, but we're overlooking the obvious here
Dark Cell is entirely psychological.
Tie yourself to the tip of a battering ram measuring approximately 16m (50ft)
Have thinman and corona hold the ends of the battering ram and run forward.
You will not be distracted by stage three. You will be propelled into stage 4 like it or not. Why prolong the suffering?
I'm trying to imagine how the logistics of that would work. First of all, how would you get the 50 foot battering ram inside the door? Let's assume that the walls are not breakable. In that case, you couldn't possibly manuever such a huge battering ram into that corridor. And that's not even getting into how people would be able to hold up the weight while walking through the first 2 phases.
a) Yes... someone suggested a battering ram with detachable segments. Good!
b) Cart + ramp.
b1) Build a large ramp outside (and by large, I mean steep, not large)
b2) Grease darkcell by pouring gallons of animal fat down the ramp
b3) Tie yourself to a cart such that there is no way for you to get off or flip the cart over or in anyway prevent your forward momentum
b4) Roll to the end of darkcell. Say hi to level 4 because you're about to get there. And if not, you'll be tied to a cart in level 3 wishing you could get off
c) catapult... well let's cross this off as infeasible
d) Tell Bloody Mary there's fresh meat at the end. I bet she's immune to the fear
e) bow & arrow with rope
e1) place a generous dab of super glue on the end of the arrow
e2) provided you have half decent aim (read better than mine) shoot blindly into darkcell in the hopes the arrow will become glued to whoever or whatever is back there
f) if (e) fails to pull anything out but the rope is firmly attached, a clever inventor could make a wind up pulley and use the rope to pull himself in