Custom Battle is the old Player-vs-Player battles before the new PvP system was impletmented with some additions. Unlike Colosseum or Duel, there is no level or deck size requirement. There are two modes for custom battles: Free-For-All and Tournament. The Free-For-All mode is a 1 battle match which ends when one player depletes the other player's deck. In Tournament mode, two players duke it out in a 2 out of 3 match.