Special bonuses are the extra points given after each operation based on skill during the operation. The requirements to obtain these bonuses are much more lenient in easier modes, but require more skill at higher difficulties. This score is added to the operation score, vital bonus, and time bonus to get the final operation score. Scoring all the bonuses is usually key to getting the S or XS rank in many operations. Common bonus criteria are: Some more are: * No misses * No Healing Touch * Complete within a certain time limit