if you want to quickly lvl up a second character you can head to the highest uber your main can then swap to the fresh character, standing on top of dungeons as they are completed with lvl you up several lvls each time, great for contests on characters Tips (General)

You also only gain as much experience as you would in the highest über that your pr would allow you. If you are 900 pr in an über 8 world, you will still only get the experience as if you were completing dungeons in über 5 world. Until your pr gets to the next tier. This is true on consoles and pc.

note that you wont be recieving any loot if your Power Rank is lower than required for that world. plus each uber has recomended levels, you get best expierence gains if you stick to those.