Pearl Harbor: Zero Hour
Click on the airplane shadow on the right side of the
mission selection screen to unlock another level and three additional
airplanes including the Raptor and UFO.
Note: The airplane shadow does not appear until level 10 is completed.
In almost all levels are special individual standing palm trees. Shoot those trees down to get 500 skill level points. A message stating "Enemy <name>'s Favorite Tree, +500" will appear. Note: Most levels have more than one of the those special individually standing palm trees.
Use the UFO to crash into some U.S. buildings. They
will become distorted and you get points as if you were the enemy.