That dude, Dionicio, the one who follows you all over, popping up when you least expect it..(like mom), well, in Muck, I took the quest to find a NEW PASSAGE, and after I completed it, I returned to Muck, but the guy won't acknowledge I completed the quest. No matter how many times I re-entered Muck, that quest will not complete. He just keeps on asking me for help (with that sly smile). And I just finished the game for the first time, and I realized I never saw him again. He's stuck in Muck. And now I kinda miss him. Ah well, is this a glitch? Actually,it was the only real problem I had, besides the light switches that did nothing, or the light switches placed where you couldn't reach them, say, above a narrow ledge overhanging a cavernous pit.