The Colosseum is a location in the video game killer7. It is a vast, empty octagonal hall dotted with various pieces of wreckage, which serves as a passageway between the Gatekeeper's lobby and each of the eight Vinculum Gates, although the game's "rails" determine which door the Smiths will step through on each visit. In the center of the Colosseum stands a small structure, although access is blocked by a door that cannot be passed until Emir Parkreiner enters the Colosseum. In order for the Smiths to gain entry through the Colosseum, the Gateman requires a payment of Soul Shells. For more information, see the page for the Vinculum Gate.