Banana Prince

Region Differences
The title screen's logo was altered, as was the copyright, removing Soldout's name; the "Start" and "Pass" doors were also recolored.

All of the characters in the game were redrawn for the German version - for example, the girl on the password screen:

Debug Menu
Hold Left + A + Select + Start on first controller then press Reset.
 * ぼうけん - "Bouken" ("Adventure") - Stage Select screen
 * ぱすわあど - "Password" - Generic Password screen
 * おんがく - "Ongaku" ("Music") - Sound Test screen
 * ろむのなか - "ROM no naka" ("Inside ROM") - CHR viewer screen
 * いべんと - "Events" - Events Debug screen

Stage Select
Press Left or Right to select any level or sublevel. Press A to start from selected level. A second invisible menu item exists. It even has its own internal variable and you can even change it the same way you change the stage number, but doesn't have any effect.

Sound Test
Use the D-Pad buttons to select Music track or BGM samples and press A to play it. The Japanese version has the composer's full name at the Sound Test screen: "しおだのぶゆき" or "Shioda Nobuyuki". The German version shortens this to "N.SHIODA".

CHR Viewer
Use A and B buttons to increase or decrease displayed bank number accordingly.

Events Debug
Use the D-Pad buttons to select any event index and press A to view it. "RING" option allows you to add some "rings" to use them at the shop or at gambling events. The number represents the value of selected rings x100.

Doki! Doki! Yuuenchi Leftover
There is an unused leftover from ''Doki! Doki! Yuuenchi'', also developed by KID, which displays the programmer copyright info. It seems that this code wasn't even planned to be displayed or used, it's clearly a leftover from the code shared between two games because it even adds an extra 100 lives to the same variable, which is unused in Banana Prince.

It can be seen with some hacking, for example using the Game Genie codes and entering the debug menu and pressing B. To return back to the menu, press A. This works for both the Japanese and German versions.