A truly unique side-scroller that offers excellent visuals, a kickass soundtrack and the ability to play with a friend.
The soundtrack is one of the game's real strengths. Instead of being an annoyance or an unwanted distraction, each track adds a whole new layer of immersion and atmosphere to the levels. The music in this game is simply awesome, especially when considering the cartridge-based platform it is played on, and the fact that it was released in the earlier years of the Genesis' lifespan.
Sound effects are average: not all that special but not all that bad, either. As the player progresses through the game, the enemies and environments get nastier and weirder-looking, the sorts of bugs, worms and slimy things that a person might find if they walked into the woods and lifted up a huge rock. The game's artists really put a lot of work into making the enemies and levels fit together cohesively. Overall the emphasis is on natural, organic lifeforms. Even the 4 selectable ships are all different types of flying organisms.
The game still retains that old-school shooter difficulty. Repetition is the key to advancing and eventually conquering it's 8 levels. There are 3 difficulty levels so it can be enjoyed by the more casual gamers out there. However, the last 3 levels of the game can't be accessed on easy mode.
The game also allows two people to play simultaneously, which increases both the fun factor and the replay value.
Bio-Hazard Battle was the first game I ever played on the Genesis, and it helped convince me to go with SEGA instead of Nintendo during the 16-bit system wars. I highly recommend it to fans of the shooter genre, and anyone else who might be interested in an experience that's old-school and out of the ordinary.