To understand Double Cross , one must understand its lineage. Monster Hunter X (Cross) was the celebratory title for the series' 10th anniversary, introducing Hunting Styles and Hunter Arts. Monster Hunter XX is the "Ultimate" or "G-rank" expansion:

Analytical Report on "Monster Hunter XX Double Cross" (3DS, JPN)

: Adds the legendary high-difficulty G-Rank quests, providing a full game's worth of new challenges beyond the base game. New Hunting Styles : Introduces Brave Style (offense-heavy) and Alchemy Style