Players can also use Skills that affect duels in various ways. Players have 4000 Life Points, Main Phase 2 is removed, the number of monster zones and spell/trap zone is reduced to 3 from 5, Main Deck size is reduced to 20-30 cards each from 40-60 and the Extra Deck is reduced to 7 from 15 (although this number is increased periodically), and players start with a 4 card hand instead of 5.
The game uses a format known as 'Speed Duels' which uses the rules of the trading card game with various modifications. As they continue to win duels, other characters become unlocked, including the character the player did not choose at the beginning. Players first have the option to play as either Yami Yugi or Seto Kaiba. Seto Kaiba has created a virtual reality 'Duel World' in order to gather the best duelists so they can compete.
