If you want to bypass the grind and unlock all modes and costumes immediately, you can use a hidden cheat at the title screen:
: Increases the overall game speed by 20% for more intense combat. Essential Fixes for the 2006 PC Version Devil.May.Cry.3.Special.Edition.rar
: You can play through the entire game as Dante’s twin brother, Vergil, who uses a unique "Dark Slayer" fighting style with his signature weapons: Yamato, Beowulf, and Force Edge. If you want to bypass the grind and
: A new continue system that allows you to restart from checkpoints indefinitely. This is much more forgiving than the original "Yellow Mode," which required a consumable item to restart from a checkpoint. This is much more forgiving than the original
: A survival mode featuring 9,999 floors of increasing difficulty.
: Most major mods, including the Style Switcher, require the game to be updated to version 1.3 to function correctly.