Unlock Versus mode
Complete the game to recieve Versus mode. Getting different Frames is all dependent on the score, amount of saves, and the number of civilians rescued.
Unlock Versus mode (simple way)
At the title screen press the following buttons; CIRCLE, X, RIGHT, LEFT, RIGHT, LEFT, DOWN, DOWN, UP, UP. If entered correctly you will hear a sound.
Give Up a Level For Health and Ammo
Pause during the game and enter the following buttons; L1, L1, L2, L1, L1, R1, L1, R1, R2, R1. You will loose one Level but your meters of Health and Ammo will fill.
Complete all of the S.O.S calls with A ranking in each to recieve an alternate ending.