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Bio-Hazard Battle (JP: Crying: Aseimei Sensou, or "Crying: Sub-Life War") is a horizontal shoot 'em up for the Sega Genesis, developed and published by Sega themselves. The game has up to two players attempting to reclaim the planet Avalon/Avaron that was ecologically destroyed by biological warfare, rendering the planet inhospitable to humans for many centuries. Bio-Hazard Battle remained a Genesis exclusive for a long time before eventually being ported to the Wii Virtual Console (in 2007) and as part of the Sega Genesis and Mega Drive Classics range on Steam (in 2010).
During a war on the planet Avalon, biological weapons caused incredible mutations of creatures such as insects, crabs and other animals, causing survivors to flee to an orbiting space station. After living in suspended animation inside the space station, the former residents of Avalon find that the planet is still hostile, but livable. They choose to fight the mutations and reclaim the planet for themselves.
The game is a standard side-scrolling shooter with 8-directional movement. A life is lost when the ship is hit once. There are 1-ups available throughout the stages and extra lives are also earned every 20,000 points.
All the ships have an organic design to them, and have their own differences in regards to speed and what abilities power-up bubbles will grant them. All ships can use the green bubbles to gain pods.
The bass heavy soundtrack is credited to K.N.U. Track listing: