From the article: inFamous 2 Cheats - PS3
On this page you will find user submitted hints and tips for the inFamous 2 video game on the PlayStation 3 console.
Hints and tips differ from cheat codes because even if a game has no codes, it can still have a ton of hints and tips. Check the PS3 Cheats index to see if there are codes for this game.
(Direct link to cheat code page.)Read through some of the hints and tips for inFamous 2, and submit your own.