Final Fantasy VII: Dirge of Cerberus (PlayStation 2)
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Unlockable: Event Viewer and Ectra Missions
Finish the entire game, then save. If you load the finished game, you can view the cut scenes, you can also unlock new side missions to do for fun. You get a cutscene for every Memory Capsule you collect the collection of a certain number of these capsules also earns you a new mission.
Unlockable: Extra Ending
You must get three G Reports before you finish. Do this and you'll get an extra ending after "The End".