Metal Slug Advance is a run and gun video game for the Game Boy Advance handheld system created by SNK Playmore in 2004, and is canon to the Metal Slug series.
However, a large blimp begins to hover above the island, as General Morden's troops parachute down and attempt to build a new base, while successfully capturing many of the new recruits.
Collecting food items can restore health, and players instantly die from being crushed or falling down a pit.
Cards can be found from shooting certain parts of the background, and by obtaining it from certain hostages, and sometimes by doing both.
The cards have many different purposes, from giving detailed info on items and characters from the Metal Slug series to boosting player abilities, and even unlocking special (and new) slugs.