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.

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

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

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

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

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

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

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

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

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

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

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.

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

To play on a particular level, enter its password below.

Level          Password
Urban Shield   1018
Black Out      1006
Ice Storm      1213
Desert Fury    0203
Tiger Trap     0917
Crack Down     0354

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