We urge you to test all files with a reliable virus scanner before opening. Research personnel are missing from the DBR Corporation, a clandestine laboratory funded by the government to conduct experiments on bio-engineered life forms. Due to the sensitive nature of the research, news of the disappearances is not publicized. You must rescue the DBR staff and fend off hordes of un-dead and other genetic mutations. The story unfolds according to the players actions, so that each game holds new discoveries.
Players can win repeatedly, each time building their score.
The story develops in different directions from an early stage of the game, allowing even beginners to enjoy the different plots.