Vehicle Arena is a mutator available for UT2004, to allow all vehicles in a map to be replaced to one type. The mutator, like other arenas of UT's past, is mod-friendly, and allows for 3rd party vehicles to be used instead of the stocks. By default, only 5 vehicles can be used; TC-1200 can be unlocked by completing campiagn as Mr. Crow, and the Leviathan, Ion Plasma Tank, Bulldog, and Phooenix are all unusable without hacking the mutator files.