How do I make Reverse Doodle Jump?

So I want to know how to make my game sort of like dungeon fall on the scirra, arcade, but endless, where the player has to jump on platforms to get down through the world.? I need help with making it endless, and how to make the platforms spawn accordingly.

Hello?

Come on, somebody???

You mean something like this ?

Oh, and sometimes your post may get missed, so try not to be patient.