? usually signals an unknown ATK, DEF or Level value.

If a monster's ATK or DEF is represented as a '?' on the card, it cannot be searched from the Deck using the relevant value, since it does not have a value whilst in the Deck.

If a monster has ? ATK or DEF and the effects that determines the ATK or DEF cannot be activatd or are negated while on the field, its ATK or DEF is treated as 0.

Community content is available under CC-BY-SA unless otherwise noted.