Bio-Hazard Battle

From Sega Retro

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BioHazardBattle MDTitleScreen.png
Bio-Hazard Battle
Publisher: Sega (JP/US/EU), Samsung (KR)
System(s): Sega Mega Drive, Virtual Console, Steam
Genre: Shoot-'em-Up

Number of players: 1-2
Release Date RRP Code
Sega Mega Drive
¥6,800 G-4087
Sega Mega Drive
$49.99[1] 1060
Sega Mega Drive
£39.99[2] 1060
Sega Mega Drive
?F 1060
Sega Mega Drive
DM ? 1060
Sega Mega Drive
?Ptas 1060
Sega Mega Drive
$? ?
Sega Mega Drive
₩? GM8069JG

Arcade (Mega Play)
¥? ?

Wii Virtual Console
600 pts ?
Wii Virtual Console
800 pts ?
Wii Virtual Console
800 pts ?

$2.99 ?
€1.99 ? ?

Bio-Hazard Battle, known as Crying: Aseimei Sensou (クライング 亜生命戦争) in Japan, is a 1992 shoot-'em-up game by Sega for the Sega Mega Drive.


The planet Avaron (Avalon on the Japanese box... reverse Engrish, incredible) was plunged into deep biological war, and a retrovirus was synthesized to try to defeat the enemy. Unfortunately, the plan backfires: the planet is rendered nearly inhospitable, and the only survivors of the virus are sent to space to await a time when the new species of creatures that survive or thrive on the virus pose little enough a threat to set up a new colony.

The game's stages display the virus outbreak, e.g. stage 2 is a ravaged city, stage 7 appears to be the facility where the virus was produced. According to the game's credits, ray tracing was used to create some graphics.


There are four bio-ships available to pilot. Tap any button to fire normal shots, and hold/release a button to fire a charge shot. There are a number of different normal shots, represented by powerup colors; strangely, normal shot types are partially shared between certain ships. Each ship has its own unique charge shot. A miniature ship circles around the bio-ship that not only fires its own shots in time with the bio-ship, but also can collect upgrades to its current weapon and can be used as a shield, absorbing enemy bullets before they can hit the bio-ship.

This happens to be one of those games where touching walls does not harm you.

Extra lives are given out based on score. Most stages also have extra lives in hidden spots; reveal by shooting.


  • Green: The only weapon shared by every ship. A general purpose spreadshot and the default weapon of each ship.
  • Red: Either a red homing laser, or red rings that are reflected on contact.
  • Blue: Either a cross shaped laser, or slow homing orbs that can destroy enemy bullets.
  • Yellow: Either a rapid fire cannon, or a straight laser that can also destroy enemy bullets.

Secret stage rumor

Various cheat sites claim there is a secret stage resembling an asteroid field. However, such an stage never existed.


Aside from the fairly lame western logo and title screen (compared to the very cool Japanese ones), the western release has autofire where the Japanese one does not. Further differences unknown.

Production credits

Digital manuals

Magazine articles

Main article: Bio-Hazard Battle/Magazine articles.

Physical scans

Mega Drive version

Sega Retro Average 
Publication Score Source
89 №1, p26Media:MeanMachinesEssentialSegaGuide Book UK.pdf[3]
90 №0101, p6[4]
93 №41, p50[1]
86 №15, p104-105[5]
94 №33, p193
78 №6, p40-41
75 №3, p40-41[6]
88 №11, p26-28[7]
88 №2, p78-80[2]
95 №26, p60-63[8]
88 №38, p35
84 №12, p80-81[9]
Sega Mega Drive
Based on
12 reviews

Mega Drive, US
BioHazardBattle MD US Box.jpg
BioHazardBattle MD US Cart.jpg
BioHazardBattle MD US manual.pdf
Mega Drive, EU
BioHazardBattle MD EU cover.jpg
BioHazardBattle MD EU Cart.jpg
Mega Drive, JP
BHB MD JP Box.jpg
Crying MD JP CartTop.jpg
Crying MD JP Cart.jpg
Crying md jp manual.pdf
Mega Drive, AU

Mega Drive, KR
Crying MD KR cover.jpg
Crying MD KR cart.jpg

Mega Play version

Mega Play,
BioHazardBattle MegaPlay Box.jpg

Technical information

ROM dump status

System Hash Size Build Date Source Comments
Sega Mega Drive
CRC32 95b0ea2b
MD5 2d6764f7a96bb8b640a0d18102756ed2
SHA-1 dca9d505302ce9ff1f98c4da95505139c7d3cafc
1MB 1992-09 Cartridge (US/EU)
Sega Mega Drive
CRC32 4aba1d6a
MD5 c54dc959882622dc6e6cc92b03dd03b9
SHA-1 c45b6da77021d57df6a9cb511cc93a5bf83ecf1c
1MB 1992-08 Cartridge (JP)
Sega Mega Drive
CRC32 dd10dd1a
MD5 e5d861fb4ce7560978b0d1aa5fbfb967
SHA-1 1445b0babb52d252bf822d8d2eec0eda05b63229
1MB 1992-08

External links


  1. 1.0 1.1 1.2 File:GamePro US 041.pdf, page 52
  2. 2.0 2.1 2.2 File:MeanMachinesSega02UK.pdf, page 78
  3. File:MeanMachinesEssentialSegaGuide Book UK.pdf, page 26
  4. File:GameFan US 0101.pdf, page 6
  5. File:Joypad FR 015.pdf, page 104
  6. File:Mega UK 03.pdf, page 40
  7. File:MegaTech UK 11.pdf, page 26
  8. File:PlayerOne FR 026.pdf, page 60
  9. File:SegaForce UK 12.pdf, page 80