Is Corpse Party PC the same as the PSP game? I remember seeing that the original PC game was different than the PSP version somehow but can't remember what the change was. Or are they porting the PSP version to PC?
As Chaosblade noted, the PC version and PSP version are a bit different, though mostly the same where it counts. Basically, the game originated as an RPGMaker title in 1996 before being drastically rewritten/redesigned and released chapter by chapter for Windows starting in 2008. A few years later, right after chapter 4 was released for Windows (but before chapter 5), a PSP port of that game was released, which changed and added quite a bit of content.
The PSP port is what we released on PSN. It has slightly more detailed backgrounds and lighting effects, more voice-acting in the early chapters, different voice-acting throughout (the two games have totally different casts), different character art, slightly arranged music tracks in the early chapters, and a bunch of Extra Chapters that were created specifically for the PSP version of the game (only 3 of the 10 Extra Chapters from the PSP version are present in the PC version -- though admittedly, the missing ones are all the really short, story-only Extra Chapters).
The PC version, then, features this vastly different voice-acting (some of which is on par with or even better than the PSP version's, and much of which greatly changes how the characters come acorss), very slightly different dialogue in a few places, slightly arranged music in the later chapters (because remember, chapter 4 came out right around the time the PSP version was released, and chapter 5 came out much later!), a decent amount of new/added content in chapter 5 (including one of the most personally disturbing settings in the entire game), and one PC-exclusive Extra Chapter based on "Tooth" from Corpse Party: Book of Shadows (but played out in the style of the original Corpse Party, complete with original puzzles and lots of content not found in the more visual novel-esque approach that BoS took).
Oh, and the PC version also has the
fanciest text boxes I've ever seen, but I don't think that really counts as a selling point. (They do look really cool, though -- they're quite heavily animated!)
-Tom