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Playstation 2 - Siren cheats

Zuno Puzzle Game
Acquire archive 087 on Kyoya Sudo's stage, Day 3, 03:00 

Time Attack Mode
Finish every scenario and objectives one and two on all stages 
After, go to the scenario selection screen and press Square.

Unlock hidden movie 
Finish the game with the 2nd ending and find all 99 archive items to 
unlock the 100th item. Go to the stage selection screen to watch the 
unlocked movie.

Archives Trick 
Finish the game and unlock the zuno puzzle game.
Go to the stage where your archive is missing, take it, after in the 
menu choose "Back To Title" option. After, enter the zuno game and 
immediately exit. The game will ask you to save on your game file. 
Save and the archive will be saved also. 

Unlock Mission Objectives 2 for every character or mission:
Complete 19 stages in any order. Go to the mission selection 
screen, highlight a stage and press L1 + R1.