The Arena is the first area of Sector 5. It is located in the center of Carthage. This is where the Transport Orb always drops off its passengers, and this is where it will return if the Lyoko Warriors fail to trip the key. Before the wall to the Core Zone opens, the Arena's walls rotate at high speeds. The walls then stop on an opening out to the Core Zone. From the outside, the Arena looks like a large, dark blue sphere. Directly below it is the Core of Lyoko.