Steel Diver is a side-scrolling submarine simulation game for the Nintendo 3DS that blends action and strategy elements. The player takes control of one of three submarines, each with unique abilities, navigating treacherous underwater environments while managing speed, depth, and angle to avoid collisions and enemy fire. The game features a campaign mode with a series of missions, ranging from combat to stealth objectives, and a periscope-strike mini-game that utilizes the 3DS's gyroscope feature for targeting. With its distinctive underwater setting and immersive 3D visuals, Steel Diver offers a unique experience combining arcade-style gameplay with tactical depth.