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"Alien Syndrome" is a side-scrolling action-adventure game developed and published by Sega for the Sega Master System in 1988.

The game is set in the distant future, where players take on the role of a space marine named Ricky, who must navigate through a series of alien-infested spaceships and rescue hostages while fighting off hordes of enemy aliens.

The gameplay of "Alien Syndrome" is similar to other side-scrolling action games of the time, such as "Contra" and "Metal Slug".

Players control Ricky as he runs, jumps, and fights his way through various levels, using a variety of weapons, including a standard gun, a laser gun, and a flamethrower, to defeat enemies and overcome obstacles.

Players must also navigate through a variety of platforming challenges, such as spikes, bottomless pits, and enemies that appear unexpectedly.

In addition to the standard platforming elements, the game also features a number of boss battles, which are generally larger, more powerful versions of the standard enemies.

One of the unique features of "Alien Syndrome" is the hostage-rescue element.

Along the way, players must rescue hostages that are being held by the aliens and bring them to the exit of the level.

If players fail to rescue all the hostages, they will not be able to advance to the next level.

The game's visuals are colorful and well-detailed, with backgrounds, animation and character design that are fitting to the game's sci-fi setting.

The sound and music are also well-done and fitting to the game's genre.

Overall, "Alien Syndrome" is an enjoyable and challenging side-scrolling action game that is well worth playing for fans of the genre.

While the game is not as well-known as other titles from the era, it is still a solid and fun game with a lot to offer.

The addition of the hostage-rescue element adds an extra layer of depth and strategy to the gameplay, making it a more engaging experience.