Siren Cheats

Finish 19 stages in any order, go to the scenario
select screen and highlight it and press L1 + R1

To unlock Mission Objectives 2 for every character and/or scenario, complete 19 stages in any order. Then, press L1 + R1 while the stage is highlighted at the scenario selection screen. Note: You will automatically obtain it after completing the random 19 stages.

Finish every scenario, and objectives one and two for all stages to unlock Time Attack Mode.

Complete the game with the second ending and collect all 99 archive items to unlock the 100th item. Go to the stage select screen and move the cursor to the upper right corner. There is a cinema that takes place in 684 AD showing the fate of the alien visitor.

Complete the game with the second ending and collect all 99 archive items to
unlock the 100th item. Go to the stage select screen and move the cursor to the
upper right corner. There is a cinema that takes place in 684 AD showing the fate
of the alien visitor.