You have to form color lines using boxes that change color every time you select a line. This boxes change from red to yellow, to green and then back to red.
Three doors opens and closes randomly. Behind each door you will see different targets. Shoot the bad guy before the door closes. Just make sure that you don't hit the nice lady by misstake.
Use the rocket power on your motorcycle to jump ramps and collect in air objects for points. Dont forget that safe landings also count and is much difficult in higher levels!
Afraid of heights? You best not be! Your sitting on top of the Golden Gate Bridge dropping water balloons on passing cars and people. How far can you go?!