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Dreamcast - Space Channel 5 cheats

Full pause screen                                                 
Press X + Y, while paused the gameplay.

Unlock Level select + Hard mode:
Finish the game, then load back your savegame. You can choose any level now. 
This will unlock new routes at a hard mode also.

Unlock Purple Ulala:
Reach minimum 95% rank to unlock Ulala

Meet with Michael Jackson:
You can see Michael Jackson at the last level.

CPU controled Ulala, 100% view rating completion:
During a gameplay, hold L + R and press Up, Left, A, Left, A, Down, Right,
B, Right, B.