We have no idea. It would require the programmers to find work-arounds to make it work on the second system, no matter which side the games came from.

It has been said several times that Metal Gear Solid 4 couldn't run on the 360 (Konami themselves said that, I mean) but we still don't actually know.
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You'd really need a game programmer who's worked on each system to know for sure. My husband is a professional video game programmer and he says the PS3 is way more powerful, but it's also way more complex. The majority of game developers don't know how to take full advantage of the system's capabilities and that is why many of the games that come out for both platforms look virtually the same.

Most of those games are also developed for the 360 first and then ported to the PS3, rather than the other way around, and I think that says something about the topic as well.
Source(s):
Personal experience

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The basic answer is no, there are no PS3 exclusive titles that would not run equally well on the 360. The question is rather moot, insofar as that it's an exclusive title to the PS3, and so we'd never know.

The main point to understand is that, yes, the PS3 is far more advanced and far more complex, and thus nobody has taken it to the full limit of it's potential. However, what that basically equates to is that the 360 is the best out-of-the-box deal - if it's so convoluted to make a game for the PS3, and it's not going to look any different from a 360 game anyway, why bother building it on the PS3 first and then porting it to the 360? I don't think the fact that most games are built on the 360 first and ported to the PS3 says anything about the topic, really - it's a simple matter of ease of programming. Sure, I could do something in a really difficult manner, then move it to a new location where doing it would be easier - or I could do it in the way that's easier to begin with, and move it to the difficult location later.

The 360 has the XNA architecture that allows for personal programmers like myself to build a "homebrew" program or game, and make it available for play on xboxLIVE. That's not just building a fan base, that's creating future employees, something the PS3 isn't even considering. They lost the exclusivity of the FInal Fantasy franchise with FFXIII, and the fact that they are still the most expensive console on the market is a hindrance to their sales. Just because their system is more powerful doesn't necessarily make it a superior console.

I have seen MGS4, and nothing about it strikes me as being completely impossible to pull off on a 360. It's just a matter of exclusivity, time, and funding. I remember the Metal Gear Solid references to the Playstation, but I also remember similar references to the XBOX and Gamecube when versions of Metal Gear Solid 2 were made for them. It's just a little fourth wall humor that Hideo Kojima likes to include, in my opinion. If there were any games that would be absolutely impossible for the 360 to play that the PS3 could pull off, it'd be touted as such in its information, akin to the Duracell vs. Energizer commercials. We won't see anything even close to that until the developers learn to better use the architecture of the PS3, and by the time that happens, we'll probably have a new generation of consoles out. I'm not being pessimistic, either - has anyone else noticed that the PS2 still has games being released for it? What is the point of having a next-gen console if developers get so frustrated by trying to use it that they revert to your previous-generation console for ease of use?
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