The various Yu-Gi-Oh! boxes can vary greatly in their contents. Often, they contain special packs that are not available for individual sale, or you get special accessories included, such as dice.
HeaderMore about Yu-Gi-Oh! Tins & BoxesBlockText2
Also called booster packs or just packs, these are the small foil packages that contain new Yu-Gi-Oh! cards. It is the primary way players acquire new cards. A pack from a specific set (or "series") always contains the same number of cards, but which cards you get is random. However, the pool of cards they are drawn from is known, so you know the approximately 100 cards in a set that you have a chance to get in a booster pack.
Yu-Gi-Oh! sets always have several rare cards, which can only be found by being lucky enough to pull them in a booster pack. These could be Ultra Secret Rare cards, or Ghost Rare.
!