Virus Cards are black-coloured cards that have various effects to make things difficult for your opponent or easier for you in a Duel. A Virus Card must be Set and can only be activated after the current turn has finished, with a few exceptions. Virus Cards may be activated during your opponent's turn.

Virus Cards may be Chained to Spell Cards, other Trap Cards, or to the effects of Effect Monsters.


A Virus Card's type is designated by a symbol to the right of the words "Virus Card". The Virus Card types are: