Trivia / Metal Slug Defense

• Ascended Fanon: It's unknown if SNK noticed that the Landseek unit in Defense is fan made, as its anti-air turret comes from Gunforce 2. Fan made sprite sheet here and the Landseek unit in action.
• Ascended Fan Nickname: Though the bosses from the original games that have no official names until Defense or Attack were only known to fans by their Fan Nickname, the Sandmarine (Mission 4 boss of Metal Slug 5) is the only one whose Fan Nickname became official, as that's what this game calls it when it was introduced to it.
• Development Gag: The description for the Stone Turtle states that it is so large that the Ptolemaic Army was defeated before they could completely unearth it. This is a boss that was cut from Metal Slug 5 due to development issues.
• Dummied Out: Most of The cast of The King of Fighters '94 are present in Attack's data as filler. Over time, they are replaced by new original characters.
• Milestone Celebration:
  • To celebrate the 20th anniversary of The King of Fighters, 6 fighters (Kyo, Benimaru, Goro, Iori, Vice, and Mature) were added to the game as purchasable units.
  • Metal Slug Attack is treated by SNK as the 20th anniversary game for the Metal Slug series.