Go to the options screen for either game and press:
Triangle + Circle + Square + X.
A new option called "FREEPLAY" will appear.
On the Difficulty Selection Screen hold:
R1 + R2 + L1 + L2 and press START
For greater firepower in two-player mode, have one player fly his jet
directly on top of the other one.
Your firepower will merge, and become faster and more powerful.
This works for both the main weapon and the secondary.
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