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Halley Wars is a shoot-em-up game developed and published by Sega for the Game Gear in 1992. The game was released exclusively in Japan and was never released in other regions.

The player takes control of a small fighter craft called the Halley, which is armed with an array of weapons including lasers, missiles, and bombs. The objective of the game is to defeat enemy forces while navigating through various levels of vertically scrolling environments. Levels are divided into sections which feature different enemies and obstacles, such as asteroids or turrets which can be destroyed for points.

The Halley has limited health and lives that can be replenished by collecting power-ups scattered throughout the levels. The player must also collect fuel capsules to keep their ship flying, as well as bonus coins that can be exchanged for extra lives or weapons upgrades. As the player progresses through each level they will encounter bosses which must be defeated before advancing to the next level.

Halley Wars features a variety of graphical effects such as parallax scrolling, sprite scaling, and transparency effects. The graphics are colorful and detailed but still remain faithful to the 8-bit aesthetic of the Game Gear hardware. The soundtrack consists of upbeat electronic music composed by Masanori Adachi that fits well with the action onscreen.

Overall Halley Wars is an enjoyable shoot-em-up experience that fans of classic shooters should definitely check out if they get the chance. Despite never officially being released outside of Japan it remains a cult classic among retro gamers thanks to its excellent visuals and addicting gameplay.