A bonus
Bonuses are in-game collectibles that appear in Run 2.
Bonuses appear as glowing yellow dots floating above the stage. Besides being a collectible, bonuses will unlock bonus levels if enough is earned. There are thirty-one bonuses for each character, with one in each level as well as in bonus levels. They are collected simply by touching one (and beating the level afterwards).
Bonuses are usually hidden somewhere out of the way in a level. Finding the bonus often requires going off the obvious path or performing a high skill trick. However, they are not necessary to beat the level and can be completely ignored if the player wishes.
The screen after beating a level and collecting the bonus.