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All fruits gets a level when being dropped, the level is equal to the level of the monster which dropped the fruit. A fruit can only be used by monsters which have a GV level that is no higher than the fruits level + 5. The long-term effects of fruits remain the same no matter which level the monster is. As such, the effects might seem neglible when fed to a low level monster but appear to be more significant when fed to a high level monster.

Fruit of HP Fruit red
Fruit of ATK Fruit orange
Fruit of DEF Fruit cyan
Fruit of SATK Fruit purple
Fruit of SDEF Fruit blue
Fruit of SPD Fruit green