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A Structure Deck is a retailed, pre-made Deck. It is similar to a Starter Deck, but is based on a certain Type, Attribute, strategy, or Yu-Gi-Oh! character. Each Deck is designed to be playable straight from the box. The older Decks included at least one single new card, printed as an Ultra Rare ; after the Curse of Darkness Structure Deck, they always introduce 5 new cards, 1 of them being a Ultra Rare, 2 of them Super Rares, and the remaining 2 as Commons (usually Spells or Traps). As opposed to Starter Decks, with the exception of Duelist Toolbox, Structure Decks may include multiple copies of the same card. They are made to play with them, unlike starter decks, that are made to learn how to play. The mat included, also features the cover monster in the background; somewhat blocking the visibility of the card zones. You can get cards that are good for your structure deck in booster packs. Another popular way to power up a structure deck is to buy multiple copies of a single Deck and combine the Deck’s best cards into one.
Starter Decks are the first three pairs of pre-constructed decks released, usually styled after a specific character’s Deck, though this does not always ring true. As opposed to Structure Decks, they are made for beginner players to learn how to play the game. As a result, the guides they give are more generally aimed (unlike Structure Decks, which are much more specific). The mat also does not feature the cover monster, but has a general background design. The original Starter decks (before Starter Deck 2006) had 50 cards, but the newest usually have 40-45 cards each.