The Perfect Bonus is a gameplay mechanic that appears in the Sonic the Hedgehog series. It is a special scoring category that grants the player unique bonuses if they complete special requirements in the respective games.
Sonic the Hedgehog 2 (16-bit)
In Sonic the Hedgehog 2 (16-bit), the Perfect Score can be earned in normal Zones. In order to clear an Act with it, the player must have collected every single Ring in the Act and not lose even a single one of them. This does not include any Rings earned from Super Ring Monitors or from Rings placed with Debug Mode. Upon clearing an Act under these conditions, the player gains an additional 50,000 points, the equivalent of an extra life.
Sonic the Hedgehog 3 & Knuckles
In Sonic the Hedgehog 3, Sonic & Knuckles and the lock-on game Sonic the Hedgehog 3 & Knuckles, Perfect Bonuses only appear in the games' Special Stages. To obtain a Perfect Bonus, the player must collect every single Ring in their Special Stage, including Rings that must be transformed by enclosing blue Spheres within a box of red Spheres, upon which the player is notified that they have gotten a Perfect Bonus. Also, whether they successfully complete the Special Stage or not by collecting its Chaos Emerald/Super Emerald, the player will be given a Perfect Bonus category in the score tallying that grants 50,000 points (and an extra life), much like the Perfect Bonus in Sonic the Hedgehog 2 (16-bit).
In Blue Sphere, the conditions for obtaining a Perfect Bonus remains the same from Sonic the Hedgehog 3 & Knuckles. Instead of getting bonus points or an extra life though, the player skips ten levels instead of one. In addition, the bonus depends on the success of the level.
In the console/PC version of Sonic Generations, the Perfect Bonus functions differently from its previous appearances. In this game, the player receives it whenever they complete an Act without losing a life. Gaining the Perfect Bonus increases the player's Rank by one after the score finishes tallying up all the points the player has earned in the Act, which is marked by the words "Perfect Bonus" appearing on the screen. This is the only way for the player to receive an S Rank for the Act, as they can only get an A Rank at the highest on their own.
In Sonic Mania, and its expansion Sonic Mania Plus, the Perfect is awarded during the Bonus Stages, which are based on their counterparts from Sonic the Hedgehog 3, Sonic & Knuckles and Sonic the Hedgehog 3 & Knuckles. It is given under the same conditions as in Sonic the Hedgehog 3 & Knuckles and Blue Sphere (collecting every Ring from the Bonus Stage, including Rings that must be transformed by enclosing blue Spheres within a box of red Spheres). Clearing a Bonus Stage with a "Perfect" score will award a gold Medallion instead of a silver Medallion.
- In Sonic the Hedgehog 2, if the player "clears" Death Egg Zone by placing a Capsule or Signpost in Debug Mode and using it, he/she will still receive a Perfect Bonus.