Endings are listed from worst to best.
Ending F ~ Bad End/Bad
Ending E ~ Bad End/Good
Ending D ~ Neutral End/Bad
Ending C ~ Neutral End/Good
Ending B ~ Good End/Bad
Ending A ~ Good End/Good
True End Bad
True End Good
Ending F ~ Bad End/Bad
Requirement ~ Finish game with Black Stone/No stone
Ending E ~ Bad End/Good
Requirement ~ Finish game with Purple Stone
Ending D ~ Neutral End/Bad
Requirement ~ Finish game with Red/Yellow/Blue stone
Ending C ~ Neutral End/Good
Requirement ~ Finish game with Green Stone
Ending B ~ Good End/Bad
Requirement ~ Finish game with Orange Stone
Ending A ~ Good End/Good
Requirement ~ Finish game with White Stone
True End Bad
Requirement ~ Secret
True End Good
Requirement ~ Secret