Metal Slug Advance Cheats (GameBoy Advance)

You will get soldier cards when you kill 100, 200, 300, and 999 soldiers (for a total of
four cards).

Every time you rescue ten prisoners, you will get a card.

There is a card in the beginning of mission 4 called Type R. If you equip the card, your
Metal Slug turns yellow and the gun moves in reverse. For example, if you are moving
forward your gun will point in the opposite direction.

During with foght with a boss, you have to take him out quickly to get its card. Grenades,
the Metal Slug and special weapons are good for this. A message will appear on screen
letting you know that you have the card.

Even though you have an unlimited amount of lives, all of the things done before that will
not count after you die; try not to die while fighting the Boss.

During Mission 5 the dungeon card. Once you complete mission 5, go to the mission select
screen and to the top left there should be an extra mission called dungeon.