To flip (known as リバース, ribāsu, "reverse" in the OCG) is to change a card from a face-down to a face-up position, or vice versa. Players are not allowed to flip a face-up card face-down, except through a card effect.
Ways of flipping monsters
There are four ways a Monster Card can be flipped:
- Through Flip Summon.
- Through battle position changes; a face-down Defense Position monster must be flipped when it changes to Attack Position through card effect like "A/D Changer".
- Through battle; a face-down Monster Card must be flipped at the Damage Step if it was attacked.
- Through a card effect, such as "Swords of Revealing Light" or "Book of Moon".