"Prison Eggs" are capsule-shaped devices created by Doctor Robotnik, designed to imprison Mobians awaiting Badnik processing. They were rarely seen in Sonic the Comic, appearing only in Issue 30's Metamorphia and in The Official Sonic the Hedgehog Yearbook '92 story, Double Sonic.

Unlike early prison designs, capsules during Robotnik's rule had no visible ways to open them. Even so, they were weak enough to be destroyed with a Spin Attack.

Capsules, as they are known elsewhere, appeared at the end of every stage in many of the Sonic games on the Mega Drive. The capsule could be opened or outright destroyed by jumping on the large button on top. Such an opening device was a major weakness, allowing heroes to save the trapped citizens inside.

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