Add-on for the game Virus! Bats are going wild under the ceiling of the hospital. Bloodthirsty monsters threaten to roam the halls, scaring both staff and patients. This night is sure to be unforgettable. The Halloween expansion introduces new, terrifying cards to the most contagious card game in the world! The expansion brings in new cards that make the gameplay more varied; a thematic expansion that can be played year-round; the game of biocidal properties.