Newbie leveling guide:
Level 1 to 69 Inside your respective campus
Level 70 to 130 Carpark1 (CP1) .. buy car ticket from npc and take bus to sports centre and right in front of you, you would be able to see the warp through CP1
Lvl 131 to 200 SR Underground.. go to Saint Research see map Look for water channel or Research Center B1F and you would be able to enter SR underground!
Lvl 201 to 231 (optional cuz you can RB at lvl 200) just incase buy osaka card from npc!
High Reborn Leveling Guide:
Lvl 1 to 22 Little Hooligan
Lvl 23 to 200 SR Underground
Lvl 201 to 231 Osaka!
HOPE THAT THIS GUIDE COULD HELP YA'LL! HAPPY LEVELING AND MORE POWER SIEGE!