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Heavy Unit S.T.G is a vertical scrolling shooter developed by Athena. It was first released by Tecmo for arcades in 1991, then ported to the Super Nintendo (SNES) in 1992, and launched in Europe as Super Strike Gunner. Set in 2008, the game follows Earth’s full-scale alien invasion. To fend off the threat, Earth scientists build two ultimate "Heavy Unit" fighters, piloted by Mark McKenzie and Jane Sinclair, who take on the mission to save humanity. Players control the high-tech Heavy Unit, fly through multiple levels, and battle various enemies including helicopters, fighter jets, tanks, and air warships. Each level ends with a powerful boss waiting to be challenged. A key feature is that players can pick one special weapon from multiple options before each level. The arcade version has 10 special weapons, while the SNES version increases the number to 15. Each weapon has unique traits, so players need to choose and use them strategically based on level features and enemy types. The game also supports two-player co-op. Two players can each select their own special weapon, fight side by side, and even merge their two fighters into a more powerful attack form, boosting the game’s strategy and fun. With its rich weapon system, diverse enemy designs, and intense gameplay pace, Heavy Unit S.T.G was one of the most beloved shooter games of its era.