When you press L, you will switch into pressure, or switch pressure (depending on if you are skating switch or regular). Once in this stance, when you jump a trick will pop up called "Pressure", and when you do a flip trick that is just Up, Down, Left, or Right, you will do a different trick from the usual pop shove-it, kickflip, heelflip, and impossible. You will be able to do toe flips (Left), 180 flips (Right), and FS and BS 360 flips (Up and Down).