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Sub-Terrania is a side-scrolling shoot 'em up video game developed by Zyrinx and published by Sega for the Sega Genesis/Mega Drive in 1993. The game follows the story of a lone pilot, known as the "Ace", who is sent to investigate an alien invasion on a distant planet. The Ace must battle through seven levels of intense action, using his ship's weapons and special abilities to defeat the aliens and save the planet.

The game features seven levels, each with its own unique environment and enemies. The player must navigate their way through each level while avoiding enemy fire and obstacles. Along the way, they can collect power-ups that will increase their ship's speed, firepower, or shield strength. As they progress through each level, they will encounter bosses which must be defeated in order to move on.

The graphics in Sub-Terrania are colorful and detailed, with vibrant backgrounds and smooth animation. The music is also quite good, featuring catchy tunes that fit well with the action on screen. The controls are simple but effective; players can move their ship left or right with ease, as well as fire their weapons or activate special abilities with just a few button presses.

Overall, Sub-Terrania is an enjoyable shoot 'em up experience that offers plenty of challenge and excitement for fans of the genre. With its great visuals and sound design, tight controls, and varied levels filled with enemies to blast away at, it's easy to see why this game has become a classic among Sega Genesis/Mega Drive owners over the years.