During game play press the Select button to bring up the Item screen and then go to Options. Press any shoulder button and if done correctly a small menu opens where you can turn off auto-aim, change the colour of the blood and reverse some of the controls.
When you get to the school that is like Hell you will find a find a pink rubber ball later in the game. go on the roof and you will find a spot with blood and a drain.
Click x next to that drain. then it will say there is a key but not in reach. then go to the valve and turn it. then the water will go in the wrong hole. then in the hole the water is going into put the rubber ball.
Then turn the valve again. then go into the courtyard and next to the building will be a key next to the drain. it is on the grass...!