Sanrio Timenet: Kako Hen and Mirai Hen

Take a time twist with Hello Kitty, because, if you ain't time traveling with Hello Kitty, you ain't time traveling...

Illusory Monsters
There are four "illusory monsters" that were ostensibly only available from magazine events or 'being an applicant', according to a page on the official Imagineer website. These monsters include No. 155, Planesta (Japanese: プラネスタ), No. 156, Planetta, No. 157 Stardust (Japanese: スターダスト) and No. 158, Time Surfer (Japanese: タイムサーファー). Time Surfer is the monster seen before the title screen loads.

To encounter one of the illusory monsters, use the GameShark codes, and  and enter a battle. All should be replaced with the monster's monster list number in hexadecimal (e.g. Planesta is, Planetta is , etc.)

Sound Test
An item called the Portable MD (Japanese: ポータブルMD) is hidden in the game and using it enables a sound test, with names for every tune. In Kako-Hen, it is found in the Sea Ruins while in Mirai-Hen it is found in the Sea Temple. The player doesn't have to obtain this item so it is missable.

To force the Portable MD in the event items section, use the code. Alternatively, the Game Genie code will start in a whited-out sound test. In order to view this, you will need to set the palettes with an emulator. Press Up or Down to select between music and sounds, and press A to play. Pressing B returns you to the main menu unless a song is already in progress, in which case it will stop the song instead.