2P mode
Press Select + R2 on both controllers at the title screen. (A tone confirms correct entry.) A new 2P Option will be displayed.

Hidden FMV sequence
Complete game at "Rockin" difficulty to view footage from the development team.

Maximum fuel and armor
Pause the game. Then press Select, L2, Select, R2, Triangle (x3), Circle. (The phrase "Way to go!" confirms correct entry.)

Invincibility
Pause the game. Then press Select, L2, Select, R2, Triangle (x3), Square. (The phrase "Way to go!" confirms correct entry.)

Disable collision detection
Pause the game. Then press Select, L2, Select, R2, Square (x4). (The phrase, "Way to go!" confirms correct entry.)

Maximum weapons
Pause the game. Then press Select, L2, Select, R2, L1, L2, R1, R2. (The phrase, "Way to go!" confirms correct entry.)

Cycle gun modes
Pause the game. Then press Select, L2, Select, R2, Select (x3). (The phrase, "Way to go!" confirms correct entry.)

Summon wingman
Pause the game. Then press Select, L2, Select, R2, Square (x3), Circle. (The phrase, "Way to go!" confirms correct entry.)

Mission complete
Pause the game. Then press Select, L2, Select, R2, Triangle (x3), Down (x3). The phrase, "Way to go!" confirms correct entry.)

Upgrade current weapon
Pause the game. Then press Select, L2, Select, R2, L1 (x2), R1 (x2). (The phrase, "Way to go!" confirms correct entry.)

Operation Power-up (bonus level)
Complete all levels. Then highlight the lowest mission on the selection screen and repeatedly press d-pad Down/Right until the mission "Operation Power-up" appears.

Remove Pause menu
Pause the game. Then press Select, L2, Select, R2, Down, R1, R2. (The phrase, "Way to go!" confirms correct entry.)

Select mission
At the main menu, hold Left + L2 then push Select. (The phrase, "Way to go!" confirms correct entry.)

Hidden Atari Classic
At the main title screen, hold SELECT and R2 on both controllers; the title screen menu will change, allowing a "Two Player Vs." option. This new game mode plays like Atari's classic top-down two player combat game, complete with "wraparound" screen.