Runner3 – Level Ratings
Here is a brief rundown on the level ratings you can get.
The highest rating you can get is a Special Perfect Double+
Perfect is when all 100 gold bars have been collected in a level.
Special is when all 25 gems AND 100 gold bars have been collected in a level.
A + (plus) is added to either of these scores if a bullseye is scored in the extra micro-game at the end. You only get to the micro-game if all 100 gold bars are collected, in either Run mode.
Keeping that in mind
Perfect+ is when you collect all 100 gold bars and then get a bullseye on a Gold Run.
Special+ is when you collect all 25 gems and 100 gold bars and then get a bullseye on a Gem Run.
Therefore, the highest rating is achieved by completing a level twice: once with a Perfect+ and once with a Special+.