To look or look at a card is to see the card's face.
At any time during the Duel, you can look at any card present in the play except:
- Face-down card on the top of Main Deck(s) and its remaining cards.
- Your opponent face-down cards and cards in their hand.
you cannot look at these cards unless a card allows you to do so; otherwise, it is regarded as cheating. For example, when an effect requires your opponent to search for a card of a specific type in their Deck, they must reveal the card to you. If they have none left in their Deck, you can prompt your opponent to reveal their Deck so that you may confirm it.
You are allowed to freely view the entire card's face, but before looking at your opponent's cards, you must ask for permission first. The opponent is not allowed to refuse or ignore the request if it's not against the rules.
After looking at the cards, they normally return to their original location and position. If you are looking at cards that are in the Graveyard, make sure you don't change the order of the cards in it.
Some cards may prevent the player from looking at cards in specific zones, like "Question".