Metal Slug 2nd Mission

Gameplay is similar to the rest of the Metal Slug series in gameplay, but with noted improvements in graphics and controls from the original Neo Geo Pocket Color game, Metal Slug 1st Mission. Beating the game will unlock Tequila, a Rebel soldier who has the ability to use the function of level selecting. Source: Wikipedia, "Metal Slug 2nd Mission", available under the CC-BY-SA License.