Mercs is a shoot 'em up influenced by Ikari Warriors . You are an anti-terrorism soldier, and must rescue a former President from a Central African revolutionary gang.
You run through each of the 8 levels, which primarily scroll horizontally, shooting everyone before they can shoot you. At times you will have to shoot trees and other scenery to progress.
Finding strategic placings is important, especially as you can't shoot while on water. Most of the time you are on foot, but at times you can hijack vehicles of shot foes. There are improved weapons, smart bombs and energy recharges to collect. Each of the 8 levels ends with a large vehicle requiring multiple shots to destroy.
Mercs was released for the Sega Genesis in October 1991. The game is classified as an Action & Adventure title. Gameplay involves running through horizontally scrolling levels, shooting enemies and collecting power-ups. Strategic placement of shots is crucial, especially when avoiding water-based attacks. Hijacking enemy vehicles can also provide temporary advantages.