Ghost Master (PlayStation 2)
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Game ends before it starts
If at the name entry screen you answer their question (Is there anyone there?) with a negative answer (for example, "No"), the game ends.
Level skip
Hold R1 + L1 and press Triangle(4) at the level selection screen. Hold R1 to skip a level or group of levels.
Maximum plasma
Hold R1 + L1 and press Square, Triangle, Square, Triangle.