What are the extra features of Cave Story on the Wii? [duplicate]
Solution 1:
Other than everything being hi-def-ier (Video and music wise), the wikipedia article seems to list a few extra game modes (and naturally you can check out the references for that info).
Solution 2:
I have read that there is a unused level that can be unlocked after beating the game called Wind Fortress. Also, a boss rush mode and Curly story where Curly is the protagonist instead of Quote.