Complete "Extra Mode" on "Combat Mode" difficulty. Then, go to the Option mode, enter "Configuration" and find the "13 Ships" mode under "Ships" settings. You can also configurate the order of the "13 Ships" appearance.
Complete "Arcade" or "Extra Mode" with "13 Ships" mode set. Then, go to the Option mode, enter "Configuration" and you can turn on "Shooting Down Rate" to display the rate of your actions during gameplay
At the title screen that says, "Press Start Button", hold L1+L2+R1+R2 and press Start. Then while holding the shoulder buttons, press Up 7 times, Down 1 time, Up 4 times and press Start. The phrase "Limiter Released will be spoken. Then, in The Option mode, enter "Configuration", and you can turn off "Credit Limit" to have unlimited continues during gameplay.
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