PS3-exclusive developer Sucker Punch will only create inFamous 3 if it can come up with "good ideas".

That's according to Sucker Punch co-founder Brian Fleming, who revealed to at E310 that he doesn't know whether a third game is on the cards.

"At the point we finish this game we'll probably have been working on it for five-and-a-half years - the two games together - so I don't know," Fleming said when asked whether work will begin on infamous 3 after inFamous 2 is wrapped up.

"It will depend on us having some good ideas. We'll have to have good ideas. We knew what we wanted to do. We knew that we could do this and present it really well. The key is we have to have good ideas. If we have good ideas, then it'll make more sense. Right now, we are trying to cash the cheque. We have a huge amount of work to do to make the game we really feel like we can make."

Although Sucker Punch created the two-million-selling PS3-exclusive inFamous only "hoping" to make a sequel, publisher Sony told the developer "to begin planning" for inFamous 2 before the game had even been released.

"We knew we were going to make a sequel the last couple months of infamous," he said.

"We and Sony felt like it was strong and it was going to be successful, so we should begin planning for that. But the truth is, we went on vacation after inFamous. It was a three-and-a-half year project non-stop. We were crispy. I went to Paris. I forget where Nate went. We went away for a while; we were tired. But we knew, I think, that at that point, by two months before we were confident and had had conversations with Sony about that."

Be sure to check out our E310 interview with Brian Fleming. InFamous 2 is due out in 2011.