Yeah, only the first two were done by Ron Gilbert and only he knows the secret of monkey island. Curse of monkey island was a good attempt to pick up from the bizzare ending of 2, but originally it was supposed to be a lot more weird. Rumours are it was kind of fourth wall breaking, with guybrush as child dreaming it all and coming back as an adult to get back into the monkey island world or something. As opposed to the (lame) secret revealed in Monkey Island 4, which has the secret unveiled as being a giant monkey robot underneath the island powered by Monkey Kombat. Sounds cool, but is unfortunately ****.