Cheat mode
Successfully complete and save the game on any difficulty setting. Start a new game from the saved game file, and wait until the starting sequence ends. After Rain leaves, you should see a small control pad on the left-hand wall immediately after the screen switches. Walk up to it and the "Use" option should appear. Press Triangle. Enter one of the following codes to activate the corresponding cheat function:
Enter "11692" at the small control pad.
Infinite ammunition
Enter "61166" at the small control pad.
Enter "10397" at the small control pad.
The right computer will turn on the left one. Once you solved the left computer, the water will drain and Hana will be able to get through.
Right Computer
Left Computer
This puzzle is located in a room with two workers, after escaping the rats and getting Video A. You must look at the panel on the left side of the screen for the solution. From left to right: 5 bars, 4 bars, 3 bars, 2 bars.
View Video B, then enter as "92572" a number to gain access.
Use the D-pad to manipulate the shape:
You cannot shoot the rats because there are too many of them. Instead, walk towards the door. Once they start breaking the door down, press L1 to turn 180 degrees. Quickly run towards the broken ladder, at the very beginning of the room. You can get Video A after the rats enter the hole.