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Placeholder Card#
From the main menu, choose the "Hyper Text" (ハイパーテキスト) card menu, then choose "Cards" (カード). Assuming the player has cards, now enter GameShark code 01FF71C4 and press A.
A card known as the Awashima Doctor (アワシマハカセ) should appear with the text "まだ、このカードのデータはありません。" (translation: "Oh, this card's data does not exist.")
ROM Padding#
Unlike typical Game Boy games which may have 0xFF or 0x00 bytes in empty areas, many empty areas of the ROM appear to be padded with "GAME STUDIO INC.", the developers of DT.