1000 Gold:
Enter "KWNOHIRO" as a password at the suspicious looking pink tank
in the first town.
Boundbomb weapon:
Enter "KKHWEEEE" as a password at the suspicious looking pink tank
in the first town.
AirGatling weapon:
Enter "GSASINRI" as a password at the suspicious looking pink tank
in the first town to unlock the AirGatling weapon for the sub-weapon
B configuration. It is for shooting down aerial targets only.
Grand Flag:
Enter "ODGRITRO" as a password at the suspicious looking pink tank
in the first town.
Angel Wings special part:
Successfully complete the game to unlock the Angel Wings part. These
allow you to fly without using a lot of fuel.
Devil Wing special part:
Win all arena battles to earn the Devil Wing special part.
Defeating the Last Master:
The Last Master has three forms. The first two are easy -- shoot him
and kill him. The last form is difficult. You have to shoot the tank
under him and destroy it. He will fall down. Make sure you hit his
face when he falls down. His armor is weak when you shoot him.
However, it is difficult to shoot him when he falls down because the
gears are moving. Be careful, as they may crush you. When the boss
gets up, the tank that is under him regenerates and you have to
destroy it again. Repeat this process until he is defeated. Note:
Shooting his face has no effect.