Mine Cells Doorway portals

Travel happens through doorway portals. Activating one opens a selection screen listing the dimensions, with the ones you have not unlocked yet shown locked along with what they need - usually a rune, or a visit to the dimension before.

The screen also decides who the portal is for. A portal can be opened for everyone on the server or for yourself alone, and closed again from the same screen, so a shared base can keep one doorway without everybody being dragged along on the same run.