Twinkle Star Sprites cheats and cheat codes for Dreamcast

Unlock Shiriochi mode
Finish the game once.

Change ADK outfit:
Modify the system date to December 25.

Unlock Mevious as playable character:
Highlight Mevious at the fighter selection screen after press
Up, Up, Up, Up, A.

Unlock Memory as playable character:
Highlight Load-Ran at the fighter selection screen after press
Down, Down, Down, Down, A.

Unlock Sprites as playable character:
Highlight Load-Ran at the fighter selection screen after press
Up, Up, Up, Up, A.

Unlock Dark-Ran as playable character:
Highlight Mevious at the fighter selection screen after press
Down, Down, Down, Down, A.