Talk:Gameplay:Unit Fusion/@comment-180.191.103.223-20151019150528/@comment-26467509-20151019152740

To my knowledge 'level' does not matter when leveling up BB/SBB however it's best to do it when they are at their maxed star level (6 for some, 7 for others) because when you evolve a unit it loses half of it's BB level. But it will always cost the same to fully level a units BB/SBB (10 each).