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If you're in the room I think that you're in, you only need two charges: One charge so that you can leap over to the jump wall and another charge to solidify the jump. In the end, facing the doorway entering into the room, you're going to want to have the jump wall to the left transparent so the above doorway is left unblocked. As you mentioned, once you've solidified three objects and go to solidify again, one of the objects will go transparent again.