i have played now again through the last level, and there are many such ladders. I've must been tired to not see them. So they have no sense in the game, there are just symbolic.
Level 1-1 in the normal ending, a ladder appears when time is going backwards. look at 4:05 on the left side. http://www.youtube.com/watch?v=shYKscyW2LA&feature=fvw
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