There are many ways to level up in Kingdom Hearts Birth by Sleep, but the best way is to grind. This guide will teach you the best grinding methods for leveling up quickly in this game. Kingdom Hearts Birth by Sleep is a game that rewards players for playing through its content multiple times. By grinding, or playing through content repeatedly, players can level up their characters quickly and achieve powerful abilities. There are many different ways to grind in Kingdom Hearts Birth by Sleep, but these are the three best methods. The first method is to complete story missions. Completing story missions will reward players with experience points and items that can be used to level up their characters. The second method is to complete bonus objectives in battle arenas. Bonus objectives can be found throughout battle arenas and can reward players with experience points, items, and sometimes rare enemies that can be used to level up characters. The third method is to find treasure chests throughout Kingdom Hearts Birth by Sleep. Treasure chests often contain rare items that can be used to level up characters quickly. These are the three best methods for leveling up in Kingdom Hearts Birth by Sleep; whichever method you choose, make sure you use all of the resources available to you! ..