While on the title screen, hold the B button and enter one of the buttons combinations below to change Quote's appearance. If entered correctly, the "Press the A Button to Begin" message will flash. The codes will work for any difficulty setting.
Effect Code Blue 1, 2, 1, 2, 1, 1, 1, Up. Christmas 1, 2, 1, 2, 1, 1, 1, 2, 2, Left. Halloween 1, 2, 1, 2, 1, 1, 1, 2, 2, +, +, -, -, Right. Red 1, 2, 1, 2, 2. Turn Quote into Curly (Or Curly into Quote) 1, 2, 1, 2, Down Yellow 1, 2, 1, 2, 1, Down.
(This should only work on the update or European version) From the Options menu, highlight the music option (Not the volume, the one with the New/Old option) and press 1 to go forward, 2 to go back. While the music is playing you can switch between Old and New to hear the original version or the New version.
Contributed By: cool_boy_mew.
Fulfill these conditions to get the three endings.
Unlockable How to Unlock Bad ending Choose to leave with Kazuma after your second time through the Egg Corridor Good ending Finish the escape sequence at the end of the game without going through the Sacred Grounds Normal ending Finish the Sacred Grounds area
Contributed By: Z6980.
Unlockable Game Modes
Only applies to the updated version; they are unlocked from the start in the original release.
Unlockable How to Unlock Boss Attack Clear the Sanctuary in Story Mode Curly Story Defeat Curly in Story Mode Nemesis challenge stage Have the Nemesis Sanctuary Time Attack Clear the Sanctuary in Story Mode
If the Wii's date is December 24 to 26 (set in thw Wii's settings), the appearance of the character in Cave Story would change into a Christmas/Holidays costume (regardless of character selected). The character and his/her costume will be in-game and in the menu.
Contributed By: Spartista7.
Alternate Credit Portraits and Dialog
After making the rocket that leads you to the last cave, do NOT talk to Momorin to get your booster back. Instead just take the rocket and keep your Mimiga Mask. There will be some dialog change after this point and some of the portraits displayed during the credits will be altered as well.
Contributed By: Deretto.
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You can submit a problem report for any non-working or fake code in the lists above.