Bypass Airplane Level
After you jump into your plane slug in Mission 5 and go onto the next screen, quickly press up until you're on top of the screen, press left and hold it. Now the enemy planes won't show up on screen and if you hold your position long enough, you will finish the level without encountering any enemies.
Contributed By: nfuse.
''Complete'' a mission
In a mission, rescue every prisoner and collect every available item (the X-Ray scan card is useful for this) to get a golden "COMPLETE" sign over a mission on the map screen.
Get Allen Jr's card
In mission 5, find and kill Allen. (He has a large machine gun, throws grenades and will slash you with a knife if you get close and is different to any normal enemy) When you do kill him, he will drop a card. Collect it, then complete the level without dieing to keep the Allen Jr card.
Get the boss cards
When you are fighting a boss, you must destroy it very quickly to get its card (A message will appear on screen informing you that you have the card) To defeat the bosses quickly you must have lots of grenades and a special weapon (like the flame shot for the fourth boss) or use the Metal Slug if you can get it (Second, third and final boss)
How to unlock soldier cards
Unlockable How to Unlock Soldier A card Kill 100 soldiers Soldier B card Kill 200 soldiers Soldier C card Kill 300 soldiers Soldier D card Kill 999 soldiers Washout Don't kill any enemies and complete a level. Just die as soon as you start a level.
Unlock All cards card
Collect all 99 cards in the game to get the final 100th "All cards" card.
Unlock Decoration Card
You need the "paper thin" card. Turn it on, then complete any mission. With paper thin turned on you will die with just one hit. The easiest way to get the decoration card is to complete mission 2, mainly because there is a Metal Slug at the near start of the level which is shielded, so if you can manage to get through the level with the Metal Slug it shouldn't be as difficult to get the card.
Unlock mission cards
You just have to clear the mission, you can die as many times as it takes.
Unlockable How to Unlock All clear Complete every mission M1 Clear Card Complete mission 1 M2 Clear Card Complete mission 2 M3 Clear Card Complete mission 3 M4 Clear Card Complete mission 4 M5 Clear Card Complete mission 5
Unlock the extra Dungeon mission
In Mission 5, find and collect the dungeon card. Then complete mission 5 and go to the mission select screen and to the top left there is an extra mission called dungeon.
Ways to unlock prisoner cards
Unlockable How to Unlock All saved Rescue all prisoners Prisoner A Card Rescue 10 prisoners Prisoner B Card Rescue 20 prisoners Prisoner C Card Rescue 30 prisoners Prisoner D Card Rescue 40 prisoners Prisoner E Card Rescue 50 prisoners Prisoner F Card Rescue 60 prisoners Prisoner G Card Rescue 70 prisoners Prisoner H Card Rescue 80 prisoners Prisoner I Card Rescue 90 prisoners
Parachute route in mission 5
In mission 5, jump into the plane slug. Now as soon as you start the level proper, press L to crash the slug. You will eject and go onto a different route where you parachute down into the enemy docks.
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