I finished InFamous (+impressions)

[Neos]

Megadude said:
Running through the game as a good guy. Neos, now that you beat it as a bad guy can you do good guy missions, or do you need a new file.

Game is excellent as hell I agree.

After you have beaten the game, you are free to explore the city and do the rest of the side missions. However, once you enter the final mission, you will notice you cannot turn back to good anymore (due to the story). Therefore you will need a new file =)