The Cage is an asymmetrical map built into the Lagoon area of Forge World. It is reminiscent of Lockout from Halo 2 and Blackout from Halo 3, but retains its own unique layout. "The Cage" was the original name for Lockout when it was in development for Halo: Combat Evolved. The version of The Cage featured in Forge World is based on these pre-Lockout ideas. It is roughly the same scale as Lockout and is built around an open center, but features longer sight lines and paths that are strictly one way. Chris Carney is said to have built this map inside Forge World in a day. The Cage appears in matchmaking.