RO Skill Simulator is Ragnarok Online skill simulator. Learned skills in RO is irreversible and if not well planned could cause remaining skill points not enough to learn build main skills perfectly. Skill reset can be costly. RO Skill Simulator automatically learn prerequisite skills so you don't have to manually learn prerequisite skills one by one. Adjust and redistribute until all build main skills are learnt and pick the best support skills until zero left over skill points.