Instructions
Start playing a game.
Fill your House meter to maximum. Your House meter is at the bottom of the screen, below your Juice meter. You can fill your House meter by scoring points and pulling off your character's various style moves.
Run at the basket from halfcourt when your House meter is full.
Press the triangle button once you get to the free throw line. This will cause you to throw an alley-oop off the backboard.
If you are playing on the Xbox, you hit the Y button.
Hit R1 and R2 simultaneously before your character leaves the ground. Your screen should display a blur effect, letting you know you are about to bring down the house.
If you are playing on the Xbox, hit the L and R buttons.
Complete the alley-oop by grabbing the ball and slamming it into the basket. The subsequent dunk is so powerful that it breaks the goal and ends the match.