Unused Minigame Icons#
Each minigame has an icon describing its genre. Of these, the icons with IDs 0x09 (Green Square (D)) and 0x0B (Brown Square (S)) are seemingly unused, as they aren't mentioned in the game's manual.
(Source: Shonumi's Dan Docs)
Unused Music#
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Two tracks in the game are unidentified, and were found by changing the music in RAM (later the subroutine was found to play music at pointer 0246). No known minigame or menu uses them.
Menu Variations#
The game has two hidden menu variations, featuring "Ahiru-chan" (a duck/bird) and "Panda-chan" instead of the rabbit. Each has their own special music.
To obtain the extended menu, enter code 0114A4C5 while in the main room with the rabbit with the menu closed and no text boxes open. Upon pressing A, there will be new options for "Panda-chan" and "Ahiru-chan".
Alternatively, use 010414C2 010416C2 or 010514C2 010516C2 in the rabbit's room to go beyond the limits of the normal menu and press A to see Panda's and Ahiru's rooms too. In doing so, this may also bring up the staff credits.
(Note: The codes above may not work properly in GBE+, but are confirmed working on real hardware.)
(Source: Torchickens)