Capsule

[[Image:Capsule_Open_S3.png|right|thumb|200px|[[Knuckles breaking an Egg Prison in IceCap Zone]]

A capsule (or egg prison) is an object that is found at the end of a zone. These ubiquitous containers are where Dr. Robotnik stores the Animal Friends he's captured. The capsule acts as a 'finish line' for the player in that once it is activated, the zone ends and the player's score is tallied. The animals are freed by jumping on a button at the top of the capsule. They appear at the end of every third act in Sonic 1 and end of every second act in Sonic 2, Sonic 3 & Knuckles and Sonic Advance. Capsules are also at the end of Action Stages in Sonic Adventure.

Sonic 1, Green Hill Zone	Sonic 2, Aquatic Ruin Zone	Sonic 3, IceCap Zone	Sonic Adventure DX, Final Egg