From what I know, there were actually more, but Ueda, being a stickler for details decided that some didn't work and he shaved a few off of the original list. He's a tough designer to work with. He's widely known for sweating the details and isn't afraid to shave months and even years worth of work on a game on a whim. He had a lot more plannded that he scrapped because he didn't feel they fit with physics engine. I mean that asshole's only been working on The Last Guardian for what? 8 years now? Pretty sure that's going to be a PS4 title at this point, which pisses me off because that was the sole reason I bought a PS3. I'm that big of a fan of his games. Sixteenth colossus is a bitch. Good Luck. Don't forget to climb the Temple and explore the world thoroughly when you're done.