You Must Have Special Permission to go to The Planet Of the Kaioshins, The Hyperbolic Time Chamber, and the Artificial Gravity room, and you must have a space pod to travel from planet to planet, or else your stuck on the planet you choose to start on. Oh and the special rooms have special atributes obviously, more on that in the rules and training pages. When Dead, evil people go to Hell, and good people go to King Kais.
Planets...
Earth
Namek
Planet Vegeta
New Namek
Space Pod
Special Rooms...
Artificial Gravity Room
Hyperbolic Time Chamber
Dead People Planets...
HELL
King Kais
Kaioshins Planet