Development
The aspect of the Metal Slug series was to create a simple, but exciting side-scrolling shoot-em-up game with a very easy control scheme (one joystick and three buttons). The same team that created Metal Slug for the Neo-Geo previously created a handful of games for Irem which have very similar graphics and gameplay. GunForce (1991) and In the Hunt (1993) had noticeably similar gameplay, with graphics that have a slight resemblance to Metal Slug. Gunforce 2 (1994), another title by Irem, had a similar gameplay as Metal Slug. Because of this, some fans refer to Gunforce 2 as "Metal Slug Zero".
Some of the stock sound effects from Irem titles were used in the Metal Slug games. The art style is done by Meeher and the music is composed by Hiya!. They worked on Undercover Cops before forming Nazca.
However, the first 3 titles were developed by the Nazca team before SNK declared bankruptcy.
It is believed that composer Takushi Hiyamuta (Hiya!) was a designer for Sammy Corporation's Metal Slug-style arcade title, Dolphin Blue, when his name was displayed during the ending credits.
After Playmore retained intellectual rights to all SNK titles, the characters Trevor and Nadia no longer appear in future installments because they were created by the Korean-based Mega Enterprise.
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