Extra ammunition:
Note: This procedure involves editing a game file; create a backup? before proceeding. Use a text editor to edit one of the “level_*” files in the game folder. Locate the “//Bullets, Projectiles, Missiles” section and increase the three numbers that follow the “Ammo” entry that is underneath to set the amount of bullets, projectiles, and missiles (in that order) that will be available in that level.
Another change that you can make is the artillery. The higher you make that number, the more mortars will be launched when you press A.
Change enemy aggression:
Note: This procedure involves editing a game file; create a backup before proceeding. Use a text editor to edit one of the “level_*” files in the game folder. Locate the “//Tank, Jet, HelicopterGun, HelicopterRocket” section and decrease the four numbers following the “Aggression” entry to lower how difficult the enemy tanks, jets, helicopter guns, and helicopter rockets (in that order) will be in that level. Note: The numbers must be from 1 through 9.
Conserving ammunition:
When the boats that carry the troops and tanks appear, do not wait until they hit the beach and the gates drop. Instead of trying to gun down every solder that comes out of those boats, use the howitzer cannon and try to destroy as many of the boats as you can before they hit the beach. Do this quickly and accurately, trying to hit each boat with the first shot. You will not be able to get all of them before they hit the beach unless done quickly. For the remaining boats, use your machine gun and gun the troo[s down as they appear from the boats. The troops will be in more of a group formation. Only use your missiles on the jets and helicopters. If you run out of missiles and need to shoot a jet down, use your machine gun and wait until they dive towards you. Shoot away at them to take them down.
Easy kills:
Fire your cannon at the back deck or grill doors on the tanks to make them explode in a huge fireball. The fireball can kill troops that are near the tank.
Unlimited ammo:
Continually pressing [Space] M will cause the gun to fire continuously, and you will have unlimited ammo: