Metal Slug - 1st Mission © 1999 SNK Corp.
Metal Slug 1st Mission plays similarly to other Metal Slug games, but has toned down graphics for the Neo Geo Pocket Color hardware. Notably, grenades are thrown by pressing the option button to switch, then fire. This was changed in the sequel. There are five different difficulty levels: kids, easy, normal, hard, and very hard.
GAME ID: NEOP00210
When the game is completed once, another character becomes playable.
The game was developed by Ukiyotei.