Metal Slug Advance -

You must finish a mission without dying after collecting a card to keep it. The "Paper Thin" Card

Obtaining this card is necessary if you want to unlock the Decoration card . Metal Slug Advance

There are 100 cards in total. You find them by shooting hidden background elements or rescuing specific hostages. You must finish a mission without dying after

While some are just for display, many cards grant gameplay bonuses like increased weapon power, new "Slug" modifications (like the Slug Gunner ), and access to hidden map routes. Metal Slug Advance

This mode makes the game play more like the original arcade titles, where players do not have a health bar.