Enter the Stage Select cheat. Then, on the machine selection screen, press Select and L1 or L2 at the same time.
Enter the Stage Select cheat and then while playing, pause and press Select and Triangle or X then release. You can repeat this to remove the effect.
At the title screen, press the Shoot button, Sub-Weapon button, and Start at the same time.
In the Option Menu, set the Level setting to LESS, then LESS, then VERY FAST. Then, set BGM to 2. This should add a new game mode ending with a +.
Pause during gameplay and press Select+Shoot Button at the same time.
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