About Fusion Digimon Adventure
Initially, only seven characters and their Digimon partners are available. During the third arc, the eighth character, Hikari, becomes available. During the course of one episode, one character assumes the role of team leader and two other characters' Digimon partners join in battle. Occasionally, the team leader will be able to talk to the other characters mid-episode. By choosing the right answer, the relationship level between those two characters is increased. This has multiple benefits, like an assist attack in-battle and unlocking extra episodes after the main story.
A battle is between a maximum of six Digimon, three on each side. By default, the player controls the Digimon of the team leader and can take manual control of the other partner Digimon through the strategy menu. It has a turn-based system wherein each Digimon can use a regular attack, use special attacks, use items, guard against an attack, or attempt to run from a wild battle.
Player will explore areas based on the episode list in the anime. Party leader is changed depending on the episode. However, most area access in the game limited by episode making most side-quests and treasure chests miss-able.
Battle using turn based system and enemy digimon can be seen on screen. Player can use Attack, Skills, Items, Digivolve, and more. 3 Digimon will be in battle. Each action will have turn delay that requires strategy before input command to Digimon.
Similar like Equipment system in RPG games, player can equip or unequip parts found in the game (side-quest, battle reward, item mix, and more). Digi-Chips has various effects which are divided into colors for each category: stat boost (red), adding skills (blue), passive ability (green), and misc effect (pink). Each Digimon has limited panel to equip parts and the panel will be extended by leveling up. Digi-Chips are strongly useful, allowing player to customize each Digimon and make them useful regardless their level and strongest
Player will have some chances to talk with other DigiDestined. By choosing the right option or do a few things to satisfy them, relationship level between characters will increase. High relationship levels will give advantages, like assist attack that make a Digimon can use extra attack without consuming SP or turn and unlocking extra episodes to unlock Mega levels for all digimons except WarGreymon and MetalGarurumon. Everyone starts with Lv. 1 relationship, except for Matt and T.K., who start at Lv. 3, with each other, and Kari, who starts with Lv. 3 to everyone.
While the main story from the anime doesn't change much, there are some scenes which changed in the game mainly due to player's decision or player's relationship level.