These adjustments are needed for a KH HD Collection release, besides graphic and audio improvement:
KH1:
- Camera controlled by right analog stick
- Swimming and flying controls adjusted
- Final Mix extras added (Cutscenes, Unknown boss, Heartless, weapons, abilities, accessories, Ansem Reports, Gummi Ship missions, Deep Dive)
- Add Beginner and Critical modes
- Add scene skip option
- Add Theater mode
- Since Disney does not have rights to Tarzan anymore, Deep Jungle would have to be removed and the scene of the villains talking about Clayton would have to be adjusted.
KH2:
- Final Mix extras added (Cutscenes, world/gameplay changes, Limit Form, Org. XIII boss battles, Data boss battles, Roxas boss battle, Lingering Will boss battle, Cavern of Remembrance, Mushroom XIII Heartless, Puzzle minigame, weapons, accessories, Birth by Sleep, etc.)
- English voices added to extended Riku/Ansem and Roxas scene (taken from 358/2 Days)
- English battle crys added to Vexen, Lexaeus, Zexion, Marluxia, and Larxene boss battles (taken from Re:Chain of Memories)
- Add Critical mode
- Add Theater mode
KH Re:CoM:
- European release
KH1:
- Camera controlled by right analog stick
- Swimming and flying controls adjusted
- Final Mix extras added (Cutscenes, Unknown boss, Heartless, weapons, abilities, accessories, Ansem Reports, Gummi Ship missions, Deep Dive)
- Add Beginner and Critical modes
- Add scene skip option
- Add Theater mode
- Since Disney does not have rights to Tarzan anymore, Deep Jungle would have to be removed and the scene of the villains talking about Clayton would have to be adjusted.
KH2:
- Final Mix extras added (Cutscenes, world/gameplay changes, Limit Form, Org. XIII boss battles, Data boss battles, Roxas boss battle, Lingering Will boss battle, Cavern of Remembrance, Mushroom XIII Heartless, Puzzle minigame, weapons, accessories, Birth by Sleep, etc.)
- English voices added to extended Riku/Ansem and Roxas scene (taken from 358/2 Days)
- English battle crys added to Vexen, Lexaeus, Zexion, Marluxia, and Larxene boss battles (taken from Re:Chain of Memories)
- Add Critical mode
- Add Theater mode
KH Re:CoM:
- European release