Most people just waste their napalm but now you can make it better.

First: Collected 2 or more napalm.
Second: shoot one and hold down the shoot button after you shoot it.
Third: While holding the shoot button type Up, Down, Down, Left, Left, Left, Right, Right.

After you follow the steps you will get a homing napalm missle. It is faster and can home more than a homing missile.