Dissidia Duellum Final Fantasy Custom Battles mode is designed to give maximum freedom in gameplay settings, catering to players seeking an experience different from standard modes. Key details include:

• Freedom in battlefield design: Players can choose the stage they want to play, whether it's Ginza in Tokyo or other maps available in the game.
• Choosing bosses and enemies: Players can select the arena boss and types of regular enemies appearing in the match, unlike Ranked or Casual modes where the system pre-determines them.
• Space for coordination and friendship: Custom Battles allows players to invite friends into private rooms, ensuring everyone is "on the same page" and can test strategies without worrying about rankings.
• Rule customization: While the core 3v3 battle structure remains, players can adjust certain conditions (custom tweaks) to fit their current play style.
• Role in the game ecosystem: Unlike modes focused on skill-based matchmaking or solo Challenges, Custom Battles serves as a practice and recreational area for players who want to create fun scenarios of their own.

In summary: Custom Battles is more than a supplementary mode; it is a scenario-building tool that lets players control key battlefield factors for high-level practice and team bonding.