The objective of Cheating Moth is to get rid of your cards before anyone else can. You have to discard a card that is one number higher or lower than the card at the top of the pile. If they are unable to, they have to draw a card.
Another way to get rid of cards is by cheating! One at a time you can slide a card up your sleeve, drop it on the floor, or by other sneaky methods, but watch out because the oldest player has the ability to call you out if you are caught, and you draw cards if you are found out.