From the main menu, enter Game Options, then select the Enter Code option. Enter any of the following codes to activate these cheats:
Bonus Level Access: SQUARE SQUARE SQUARE TRI CIR TRI SQUARE SQUARE
Disable All Cheats: SQUARE SQUARE X CIR CIR CIR CIR TRI
Fifth Ship Enabled: X X X SQUARE TRI CIR X TRI
Full Level Access: SQUARE TRI CIR TRI X TRI SQUARE X
Infinite Firewalls: X X SQUARE X X X TRI TRI
Infinite Lives: CIR X X TRI SQUARE TRI SQUARE CIR
Infinite Weapons: SQUARE X CIR SQUARE X SQUARE CIR SQUARE
No Bonus Reset on Death: SQUARE TRI X TRI CIR SQUARE TRI X
Water Effect On: CIR X SQUARE TRI TRI CIR TRI CIR