A Flip effect (リバース効果 Ribāsu Kōka "Reverse Effect"), formatted Flip Effect prior to the version 9.0 TCG rulebook, is a kind of Trigger Effect possessed exclusively by Flip monsters. This kind of effect activates when the Flip monster is flipped face-up (by battle, a Flip Summon, or a card effect). In card text, Flip effect is marked with the all-caps text "FLIP: ". Previously, Flip Effects were considered a distinct kind of effect from Trigger Effects, and several card effects specifically affected Flip Effects; such cards now instead affect all effects of Flip monsters.