Action Replay is a system used to alter game behavior and get results that the publishers never intended to happen in game. For example, a code I found lets me play as Roxas in Sora's part of the story. (This means roxas in other worlds too) and others include replacing donal with a useless rock, playing as world characters, getting some secret keyblades (not very special just hidden game files). There are also room mods to let you go into rooms that you normally could not, like cutscene rooms.
KH2 Rooms:
Destiny Islands
Roxas's Bedroom
World of Darkness (not sure where these locations are, perhaps the cutscene at the beginning and end, or in that black nothing world)
Nighttime Beach in Atlantica
Castle Oblivion (Roxas' flashback)
KH2FM+: (only?)
Org. XIII meeting room (in one of Roxas's flashbacks)
Hall of the Cornerstone with black hole in wall
Staircase in Ansem's lab
Ansem's Study (past, not destroyed)
KH1:
Sora's Room (actually TWO rooms!)
Endless Meadow
possibly Castle Oblivion
Disney Castle Throne Room
a crater island (boundaries are actually set, so perhaps this was a deleted at the last minute place? reminiscent of Destiny Island fights with Ansem)
Final Door
I do not actually know these codes, have only heard of or watched vids about them. I would appreciaate it if ANYONE could give us some GOOD codes for room mods!:cursing: