Metal Slug Advance

Hint: Prisoner cards:
Every time you rescue ten prisoners, you will get a card.
Information in this section was contributed by megabusterblue4.

Hint: Solider cards:
You will get soldier cards when you kill 100, 200, 300, and 999 soldiers (for a total of four cards).
Information in this section was contributed by megabusterblue4.

Hint: Type R 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.
Information in this section was contributed by megabusterblue4.

Hint: Collecting card and kills:
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.
Information in this section was contributed by megabusterblue4.

Hint: Alternate mission completion marker:
Rescue all prisoners and collect all items in a mission. Note: Use the X-Ray Scan card to make this easier. The mission name will be marked with a gold "Complete" sign at the selection screen.