Where is THE best place to lvl up at?

Well it depends on who your trying to level up and what level they are. If your trying to level up Yusuke or Hiei then anywhere is good if your trying to level up Kuwabara, Touya, Jin, Chu, or Kurama id suggest the swamp or ocean cliffs every one else id say the hotel would be your best and safest bet. P.s the best team in my opinion is 1.Yusuke 2.Hiei 3.Yukina 4.Masked fighter 5.Kurama. Well hope that helps peace and good luck.

He/she is right. You should also try lvling up by how hard each stage is.

I level the characters up in different places depending on their level. For example when you get Hiei he is on level 4 or 5 so I go to the 3rd level of the hotel level up 2 or 3 levels then move to the next level. Then level up another 3 or 4 levels and so on. I stay on the level where you get Hiei to get spirit & healing potions built up for the characters before I get Yukina after I get her I hardly ever use the potions.

Hey everyone! ^-^ The best place to train is in the last levels where you fight the "Toguro" brothers. There is a level where you have to "Capture" one of those sprinter turtles. Use Hiei's Dragon Summon for an instant kill. It gives a lot of experience and you can bring 5 other people you need to level up along! Just make sure your Hiei is strong enough to 1 hit K-O the turtle. {You're Welcome, From FwgKnight}