Bacteria

An unknown protagonist is hired by Armtech Ltd. to control the submarine Deep Vessel, shrunken to microscopic size inside the body of sick Dr. Michail Rasarow. As the doctor is suffering from an unknown disease, the task is to hunt down the viruses in his body and kill them.

Bacteria is a 3D arcade shooter, but instead of space, it takes place in the human body. The submarine is controlled using arrow keys or WASD keys, with mouse buttons to fire weapon or torpedo rockets. The player has to navigate the submarine through the body, avoiding collision with the red cells and eliminating the floating viruses.

HUD consists of targets marked by different colors: yellow indicating waypoint, white being a potential enemy or target, green collectibles and neutral blue, objects. Game offers 30 different enemies and 50 levels to complete.