Mercs is a 1990 top-down run and gun arcade game developed and published by Capcom for the arcades and later released on the SEGA Mega Drive / Genesis which was first released in Japan on September 27, 1991, with subsequent releases in North America and Europe.
 Game Play
The Mega Drive / Genesis version features two different game modes: an "Arcade Mode", which features the same plot and stages as the arcade version, as well as an "Original Mode" that introduces a new plot with all new stages. One notable aspect which distinguish the Original Mode from the Arcade Mode is the addition of Weapon Shops thorough the game in which the player can buy power-ups for their character using currency obtained from defeated enemy soldiers, as well as the option to switch between multiple playable characters, each characterized by the weapon they wield (with the starting character using the standard Assault Rifle). Unlike the arcade version, the Mega Drive version of Mercs only allows for a single player.