Cell Key

Cell Key is a special key that appeared in Sonic Heroes. They are usual keys with the ability to open Eggman's prison and they are Team Chaotix's main objective in Final Fortress.

Description
The Cell Keys resemble mostly keys for lever-type locks, but they have on it's head the Eggman Empire symbol and they are usually found in cages surrounded by enemies that the player must destroys them to get the key or afloat on the ground. The Cell Keys are found exclusively in Team Chaotix's version of Final Fortress where ten of them can be found hidden in the Stage. The objective for the player in this Stage is to collect all ten Cell Keys in the  Extra Mission, but in  the regular stage the player has to just collects five Cell keys. When touching a Cell Key, It will give off a small "ping" and then slowly fade away.