Forbidden

In the OCG and the TCG Advanced Format, Forbidden (禁止 Kinshi, "Prohibited") cards are cards that players are not allowed to use in their Main Deck, Side Deck, or Extra Deck. There are no Forbidden cards in the Traditional Format; by default, all Forbidden cards are Limited in the Traditional Format.

These cards are Forbidden as of April 1, 2014 for both the OCG and the TCG Advanced Format.

Anime/Manga
During Battle City it is mentioned that "directly damage the player" are forbidden such as "Hinotama" and "Meteor of Destruction".

In Yu-Gi-Oh! GX it is mentioned that "Chaos Emperor Dragon - Envoy of the End" is forbidden.

A handful of other cards are noted by characters as "forbidden" in the anime, including "Golden Castle of Stromberg" in the original series and "Infernalvania" in''Yu-Gi-Oh! GX''.