New special "maze system" added into last version of CF (2.0). It uses the same build like is in CF SP late mission where Trent enters Dyson sphere where is located Nomad City which have "maze" inside. In Multiplayer is this system used for special races (event led by any member of the server staff).
We do not have map for it ... (hint: look for arrows on walls)
Entry to this system is through jump-gate in Arena system (it is also exit point of this "maze" system).